basis-map coefficients of A112227 → basis A013609 → basis A013609

nonnegative coefficientsonly rational roots

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

Recurrence

\(P_{n}(x) = \left(3 + 4\,x\right)\,P_{n-1}(x)\)
\(P_{1}(x) = 9 + 24\,x + 16\,x^{2}\)

Rows ?

nx0x1x2x3x4x5x6x7x8x9x10x11x12x13x14x15x16Pn(1)
19241649
22710814464343
3814328647682562401
42431620432057603840102416807
57295832194403456034560184324096117649
6218720412816481814402419201935368601616384823543
7656169984326592870912145152015482881032192393216655365764801
8196832361961259712391910478382081045094492897285308416176947226214440353607
959049787320472392016796160391910406270566469672960530841602654208078643201048576282475249
10177147259815617321040692841601847577603448811524598415364379443202919628801297612803460300841943041977326743
11531441850305662355744277136640831409920177367449627590492163153199104262766592015571353606228541441509949441677721613841287201
1215943232763493222107945610808328963602776320864666316815371845632204957941762049579417615182069760809710387229444014086543114246710886496889010407
1347829698928208877377809641268165121513166054440351094784807021895681229747650561434705592321275293859848501959065641221619712137405399042818572288268435456678223072849
141434890728697814026784626401547556192061902247680181579926528403510947840691733053440922310737920956470394880765176315904463743221760206108098560634178764801207959552010737418244747561509943
15430467219183300489183300480571405363202476089907207923487703041936852549632368924295168055338644275206558654136320612141052723244519349288962473297182720101468602368028991029248051539607552429496729633232930569601
Technical details
Node id
n-ab357062c112329e · revision 0 · JSON
Definition source
derived:basis_map_A013609
Fingerprint
f6-c91d5d506c107735

Observed on the stored rows ?

  • Degrees: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 (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:      9,      24,       16;
   2:     27,     108,      144,       64;
   3:     81,     432,      864,      768,       256;
   4:    243,    1620,     4320,     5760,      3840,      1024;
   5:    729,    5832,    19440,    34560,     34560,     18432,      4096;
   6:   2187,   20412,    81648,   181440,    241920,    193536,     86016,     16384;
   7:   6561,   69984,   326592,   870912,   1451520,   1548288,   1032192,    393216,     65536;
   8:  19683,  236196,  1259712,  3919104,   7838208,  10450944,   9289728,   5308416,   1769472,    262144;
   9:  59049,  787320,  4723920, 16796160,  39191040,  62705664,  69672960,  53084160,  26542080,   7864320,  1048576;
  10: 177147, 2598156, 17321040, 69284160, 184757760, 344881152, 459841536, 437944320, 291962880, 129761280, 34603008, 4194304;
%F Formula
The row polynomials satisfy P(n,x) = (3+4*x)*P(n-1,x) for n >= 2, with P(1,x) = 9 + 24*x + 16*x^2.
%t Mathematica
P[1, x_] := 9 + 24*x + 16*x^2;
P[n_, x_] := P[n, x] = Expand[(3 + 4*x)*P[n - 1, x]];
Table[CoefficientList[P[n, x], x], {n, 1, 10}] // Flatten
%o PARI/GP
P(N) = {my(v = vector(N)); v[1] = 9 + 24*x + 16*x^2; for(n = 2, N, my(i = n); v[i] = (3 + 4*x)*v[i - 1]); 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. [SP14] J Schur and G Polya. Über zwei Arten von Faktorenfolgen in der Theorie der algebraischen Gleichungen. J. Reine Angew. Math., 1914.