A085880 → basis A013609 → x ↦ x+1

nonnegative coefficientsonly rational roots

Proved for all n all roots real, in (−∞, −1]coefficients of one signHadamard kernelinterlacing (weak)

Recurrence

\(\left(n\right)\,P_{n}(x) = \left(-24 - 12\,x + 16\,n + 8\,n x\right)\,P_{n-1}(x)\)
\(P_{1}(x) = 1\)

Rows ?

nx0x1x2x3x4x5x6x7x8x9x10x11x12x13x14Pn(1)
111
2426
33232872
4320480240401080
5358471685376179222418144
64300810752010752053760134401344326592
754067216220162027520135168050688010137684486158592
8702873624600576369008643075072015375360461260876876854912120092544
9937164803748659206560153606560153604100096001640038404100096058572803660802401850880
10127454412857354485761147089715213382713344100370350085018517504167283916835846553644808192248934448997757952
11176118824968805941248019813367808026417823744023115595776013869357465657788989440165111398403095838720343982080171991041015589892096
1224656635494413561149521923390287380480508543107072050854310707203559801749504177990087475263567888384015891972096026486620160264866201612039372821327387734016
1334898622545922093917352755257582727200768959712120012801079676135014408637409080115250384886300672215935227002886747975843840149955018752022493252812820448411648852017152452796847276032
144985517506560032405863792640097217591377920017823225085952002227903135744000200511282216960013367418814464006683709407232002506391027712006962197299200013924394598400189878108160015823175680060858368009702789584486400
1571791452094464050254016466124801633255535149056032665110702981120449145272165990404491452721659904033685895412449280192490830928281608421473853112320280715795103744070178948775936012759808868352015949761085440122690469888043818024960209580255024906240
Technical details
Node id
n-816bdb5b69d24e1f · revision 0 · JSON
Definition source
derived:shift_x_plus_one
Fingerprint
f6-11aec07ce60b6d61

Observed on the stored rows ?

  • Degrees: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 (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 = 1, …, ascending powers of x
%e Example
Triangle begins:
   1:          1;
   2:          4,          2;
   3:         32,         32,           8;
   4:        320,        480,         240,          40;
   5:       3584,       7168,        5376,        1792,         224;
   6:      43008,     107520,      107520,       53760,       13440,       1344;
   7:     540672,    1622016,     2027520,     1351680,      506880,     101376,       8448;
   8:    7028736,   24600576,    36900864,    30750720,    15375360,    4612608,     768768,     54912;
   9:   93716480,  374865920,   656015360,   656015360,   410009600,  164003840,   41000960,   5857280,   366080;
  10: 1274544128, 5735448576, 11470897152, 13382713344, 10037035008, 5018517504, 1672839168, 358465536, 44808192, 2489344;
%F Formula
The row polynomials satisfy n*P(n,x) = (16*n-24+(8*n-12)*x)*P(n-1,x) for n >= 2, with P(1,x) = 1.
%t Mathematica
P[1, x_] := 1;
P[n_, x_] := P[n, x] = Expand[Together[((16*n - 24 + (8*n - 12)*x)*P[n - 1, x])/(n)]];
Table[CoefficientList[P[n, x], x], {n, 1, 10}] // Flatten
%o PARI/GP
P(N) = {my(v = vector(N)); v[1] = 1; for(n = 2, N, my(i = n); v[i] = ((16*n - 24 + (8*n - 12)*x)*v[i - 1])/(n)); v};
row(n, p) = {my(c = Vecrev(p)); c};
T(N) = {my(v = P(N)); concat(vector(#v, i, row(i, v[i])))};
T(10)

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.