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A146967 A polynomial based symmetrical sequence: p(x,n)=If[n == 0, 1, (x + 1)^n + 2^(n - 3)*Sum[(2^(m - 1) +n*m - n + 1)*x^m*(1 + x^(n - 2*m)), {m, 1, n - 1}]. 0
1, 1, 1, 1, 4, 1, 1, 11, 11, 1, 1, 34, 34, 34, 1, 1, 109, 102, 102, 109, 1, 1, 350, 303, 292, 303, 350, 1, 1, 1127, 901, 819, 819, 901, 1127, 1, 1, 3688, 2716, 2296, 2182, 2296, 2716, 3688, 1, 1, 12425, 8420, 6548, 5822, 5822, 6548, 8420, 12425, 1, 1, 43402 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Row sums are:{1, 2, 6, 24, 104, 424, 1600, 5696, 19584, 66432, 226304}.

LINKS

Table of n, a(n) for n=0..56.

FORMULA

p(x,n)=If[n == 0, 1, (x + 1)^n + 2^(n - 3)*Sum[(2^(m - 1) +n*m - n + 1)*x^m*(1 + x^(n - 2*m)), {m, 1, n - 1}]]; t(n,m)=Coefficients(p(x,m)).

EXAMPLE

{1}, {1, 1}, {1, 4, 1}, {1, 11, 11, 1}, {1, 34, 34, 34, 1}, {1, 109, 102, 102, 109, 1}, {1, 350, 303, 292, 303, 350, 1}, {1, 1127, 901, 819, 819, 901, 1127, 1}, {1, 3688, 2716, 2296, 2182, 2296, 2716, 3688, 1}, {1, 12425, 8420, 6548, 5822, 5822, 6548, 8420, 12425, 1}, {1, 43402, 27181, 19320, 15826, 14844, 15826, 19320, 27181, 43402, 1}

MATHEMATICA

Clear[p, x, n]; p[x_, n_] = If[n == 0, 1, (x + 1)^n + 2^(n - 3)*Sum[(2^(m - 1) + n*m - n + 1)*x^m*(1 + x^(n - 2*m)), {m, 1, n - 1}]]; Table[CoefficientList[FullSimplify[ExpandAll[p[x, n]]], x], {n, 0, 10}]; Flatten[%]

CROSSREFS

Sequence in context: A008292 A174036 A157221 * A173152 A156049 A192015

Adjacent sequences:  A146964 A146965 A146966 * A146968 A146969 A146970

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Nov 03 2008

STATUS

approved

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Last modified February 25 13:30 EST 2018. Contains 299654 sequences. (Running on oeis4.)