A156992 → basis A007318 → basis A013610

palindromicγ-positivenonnegative coefficientsonly rational roots

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

Recurrence

\(P_{n}(x) = \left(3 + 3\,x + 3\,n + 3\,n x\right)\,P_{n-1}(x)\)
\(P_{0}(x) = 1\)

Rows ?

nx0x1x2x3x4x5x6x7x8x9x10x11x12x13x14Pn(1)
011
16612
25410854216
3648194419446485184
497203888058320388809720155520
5174960874800174960017496008748001749605598720
6367416022044960551124007348320055112400220449603674160235146240
78817984061725888018517766403086294400308629440018517766406172588808817984011287019520
82380855680190468454406666395904013332791808016665989760013332791808066663959040190468454402380855680609499054080
9714256704006428310336002571324134400599975631360089996344704008999634470400599975631360025713241344006428310336007142567040036569943244800
102357047123200235704712320001060671205440002828456547840004949798958720005939758750464004949798958720002828456547840001060671205440002357047123200023570471232002413616254156800
11848536964352009333906607872004666953303936000140008599118080002800171982361600039202407753062400392024077530624002800171982361600014000859911808000466695330393600093339066078720084853696435200173780370299289600
123309294160972800397115299316736002184134146242048007280447154140160001638100609681536000262096097549045760030577878047388672002620960975490457600163810060968153600072804471541401600021841341462420480039711529931673600330929416097280013554868883344588800
13138990354760857600180687461189114880010841247671346892800397512414616052736009937810365401318400017888058657722373120023850744876963164160023850744876963164160017888058657722373120099378103654013184000397512414616052736001084124767134689280018068746118911488001389903547608576001138608986200945459200
1462545659642385920008756392349934028800056916550274571187200022766620109828474880006260820530202830592000125216410604056611840001878246159060849177600021465670389266847744000187824615906084917760001252164106040566118400062608205302028305920002276662010982847488000569165502745711872000875639234993402880006254565964238592000102474808758085091328000
Technical details
Node id
n-013702744a4ea045 · revision 0 · JSON
Definition source
derived:basis_map_A013610
Fingerprint
f6-77a7ed3b1d5f257e

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 0)
  • Palindromic rows: yes
  • γ-positive (gamma_positive): yes
  • 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:           1;
  1:           6,            6;
  2:          54,          108,            54;
  3:         648,         1944,          1944,           648;
  4:        9720,        38880,         58320,         38880,          9720;
  5:      174960,       874800,       1749600,       1749600,        874800,        174960;
  6:     3674160,     22044960,      55112400,      73483200,      55112400,      22044960,       3674160;
  7:    88179840,    617258880,    1851776640,    3086294400,    3086294400,    1851776640,     617258880,      88179840;
  8:  2380855680,  19046845440,   66663959040,  133327918080,  166659897600,  133327918080,   66663959040,   19046845440,   2380855680;
  9: 71425670400, 642831033600, 2571324134400, 5999756313600, 8999634470400, 8999634470400, 5999756313600, 2571324134400, 642831033600, 71425670400;
%F Formula
The row polynomials satisfy P(n,x) = (3*n+3+(3*n+3)*x)*P(n-1,x) for n >= 1, with P(0,x) = 1.
%t Mathematica
P[0, x_] := 1;
P[n_, x_] := P[n, x] = Expand[(3*n + 3 + (3*n + 3)*x)*P[n - 1, x]];
Table[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten
%o PARI/GP
P(N) = {my(v = vector(N + 1)); v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = (3*n + 3 + (3*n + 3)*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 - 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.