A085881 → basis A013611 → D

nonnegative coefficientsonly rational roots

Proved for all n all roots real, in (−∞, 0]coefficients of one signHadamard kernelinterlacing (weak)

Recurrence

\(\left(-1 + n\right)\,P_{n}(x) = \left(-2\,n - 4\,n x + 4\,n^{2} + 8\,n^{2} x\right)\,P_{n-1}(x)\)
\(P_{0}(x) = 0\)
\(P_{1}(x) = 4\)

Rows ?

nx0x1x2x3x4x5x6x7x8x9x10x11x12x13Pn(1)
00
144
24896144
3720288028806480
41344080640161280107520362880
5302400241920072576009676800483840024494400
67983360798336003193344006386688006386688002554675201939956480
724216192029059430401452971520038745907200581188608004649508864015498362880176536039680
883026944001162377216006974263296002324754432000464950886400055794106368003719607091200106274488320018157992652800
9317578060800508124897280035568742809600142274971238400355687428096000569099884953600569099884953600325199934259200812999835648002083629656908800
10134088514560002413593262080001930874609664000901074817843200027032244535296000540644890705920007208598542745600061787987509248000308939937546240006865331945472000263926423208448000
116194889372672001238977874534400011150800870809600059470937977651200020814828292177920004995558790122700800832593131687116800095153500764241920007136512557318144000317178335880806400063435667176161280036580202256690892800
123108708121559040068391578674298880068391578674298880004103494720457932800016413978881831731200045959140869128847360091918281738257694720013131183105465384960001313118310546538496000875412207031025664000350164882812410265600636663423295291392005506983176098192588800
131683883565844480000404132055802675200004445452613829427200002963635075886284800000133363578414882816000004267634509276250112000099578138549779169280000170705380371050004480000213381725463812505600000189672644856722227200000113803586914033336320000413831225141939404800006897187085698990080000894884766115956295680000
1497924305829109760000254603195155685376000030552383418682245120000224050811737003130880000112025405868501565440000040329146112660563558400001075443896337615028224000021508877926752300564480000322633168901284508467200003584812987792050094080000028678503902336400752640000156428203103653095014400005214273436788436500480000802195913352067153920000156122973042383759892480000
Technical details
Node id
n-83e01962f87310bb · revision 0 · JSON
Definition source
derived:derivative
Fingerprint
f6-11aec07ce60b6d61

Observed on the stored rows ?

  • Degrees: -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 (affine: slope 1, intercept -1)
  • Palindromic rows: no
  • γ-positive (gamma_positive): no
  • Nonnegative coefficients (nonn): yes
  • Only rational roots (rr_by_factors: every nonzero row is a product of linear factors over ℚ): yes

Matches ?

No OEIS matches.

Submission text ?

Atlas rows n = 0, …, ascending powers of x
%e Example
Triangle begins:
  0:            0;
  1:            4;
  2:           48,            96;
  3:          720,          2880,           2880;
  4:        13440,         80640,         161280,          107520;
  5:       302400,       2419200,        7257600,         9676800,         4838400;
  6:      7983360,      79833600,      319334400,       638668800,       638668800,       255467520;
  7:    242161920,    2905943040,    14529715200,     38745907200,     58118860800,     46495088640,     15498362880;
  8:   8302694400,  116237721600,   697426329600,   2324754432000,   4649508864000,   5579410636800,   3719607091200,   1062744883200;
  9: 317578060800, 5081248972800, 35568742809600, 142274971238400, 355687428096000, 569099884953600, 569099884953600, 325199934259200, 81299983564800;
%F Formula
The row polynomials satisfy (n-1)*P(n,x) = (4*n^2-2*n+(8*n^2-4*n)*x)*P(n-1,x) for n >= 2, with P(0,x) = 0, P(1,x) = 4.
%t Mathematica
P[0, x_] := 0;
P[1, x_] := 4;
P[n_, x_] := P[n, x] = Expand[Together[((4*n^2 - 2*n + (8*n^2 - 4*n)*x)*P[n - 1, x])/(n - 1)]];
Table[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten
%o PARI/GP
P(N) = {my(v = vector(N + 1)); v[1] = 0; v[2] = 4; for(n = 2, N, my(i = n + 1); v[i] = ((4*n^2 - 2*n + (8*n^2 - 4*n)*x)*v[i - 1])/(n - 1)); v};
row(n, p) = {my(c = Vecrev(p)); c};
T(N) = {my(v = P(N)); concat(vector(#v, i, row(i - 1, v[i])))};
T(9)

polytool c48629374597

Properties

Proof chains ? JSON

Same fingerprint ?

References

  1. [Bra06] Petter Brändén. On linear transformations preserving the Pólya frequency property. Transactions of the American Mathematical Society, 358(8):3697–3716, February 2006. doi:10.1090/s0002-9947-06-03856-6
  2. [Bra15] Petter Brändén. Unimodality, log-concavity, real-rootedness and beyond. Handbook of enumerative combinatorics, :437–483, March 2015. doi:10.1201/b18255-10
  3. [LW07] Lily L. Liu and Yi Wang. A unified approach to polynomial sequences with only real zeros. Advances in Applied Mathematics, 38(4):542–560, May 2007. doi:10.1016/j.aam.2006.02.003
  4. [SP14] J Schur and G Polya. Über zwei Arten von Faktorenfolgen in der Theorie der algebraischen Gleichungen. J. Reine Angew. Math., 1914.