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A155950 A triangle of polynomial coefficients: q(x,n)=(1 - x)^(n + 1)*Sum[(2*k + n)^n*x^k, {k, 0, Infinity}]; p(x,n)=q(x,n)+x^n*q(1/x,n). 0
1, 1, 2, 2, 8, 8, 26, 22, 22, 26, 272, -64, 352, -64, 272, 2882, -486, 1444, 1444, -486, 2882, 50752, -93056, 230336, -283904, 230336, -93056, 50752, 745418, -1182562, 2112618, -1030354, -1030354, 2112618, -1182562, 745418, 18456832, -66045952 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Row sums are:

{2, 4, 16, 96, 768, 7680, 92160, 1290240, 20643840, 371589120, 7431782400,...}.

LINKS

Table of n, a(n) for n=0..37.

FORMULA

q(x,n)=(1 - x)^(n + 1)*Sum[(2*k + n)^n*x^k, {k, 0, Infinity}];

p(x,n)=q(x,n)+x^n*q(1/x,n);

t(n,m)=coefficients(p(x,n))

EXAMPLE

{1, 1},

{2, 2},

{8, 8},

{26, 22, 22, 26},

{272, -64, 352, -64, 272},

{2882, -486, 1444, 1444, -486, 2882}, {50752, -93056, 230336, -283904, 230336, -93056, 50752},

{745418, -1182562, 2112618, -1030354, -1030354, 2112618, -1182562, 745418},

{18456832, -66045952, 193838080, -342063104, 412272128, -342063104, 193838080, -66045952, 18456832},

{347066882, -1114674254, 2662543720, -3229707896, 1520566108, 1520566108, -3229707896, 2662543720, -1114674254, 347066882},

{11073741824, -59833329664, 216555369472, -500687839232, 812895791104, -952575684608, 812895791104, -500687839232, 216555369472, -59833329664, 11073741824}

MATHEMATICA

Clear[p, x, n, m];

p[x_, n_] = (1 - x)^(n + 1)*Sum[(2*k + n)^n*x^k, {k, 0, Infinity}];

Table[FullSimplify[ExpandAll[p[x, n]]], {n, 0, 10}];

Table[CoefficientList[FullSimplify[ExpandAll[p[x, n]]], x]

+ Reverse[ CoefficientList[FullSimplify[ExpandAll[p[x, n]]], x]], {n, 0, 10}];

Flatten[%]

CROSSREFS

Sequence in context: A099328 A073090 A120544 * A162959 A158302 A007083

Adjacent sequences:  A155947 A155948 A155949 * A155951 A155952 A155953

KEYWORD

sign,tabl,uned

AUTHOR

Roger L. Bagula, Jan 31 2009

STATUS

approved

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Last modified January 17 22:33 EST 2022. Contains 350410 sequences. (Running on oeis4.)