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A161498 Expansion of x*(1-x)*(1+x)/(1-13*x+36*x^2-13*x^3+x^4). +0
1
1, 13, 132, 1261, 11809, 109824, 1018849, 9443629, 87504516, 810723277, 7510988353, 69584925696, 644660351425, 5972359368781, 55329992188548, 512595960817837, 4748863783286881, 43995092132369664, 407585519020921249 (list; graph; listen)
OFFSET

1,2

COMMENT

Proposed by R. Guy in the seqfan list, Mar 29 2009.

FORMULA

a(n) = A139400(n)/ ( A001906(n)*A001353(n)*A004254(n)) = 13*a(n-1)-36*a(n-2)+13*a(n-3)-a(n-4).

CROSSREFS

Cf. A006238.

Sequence in context: A037582 A065539 A048554 this_sequence A037715 A037617 A081042

Adjacent sequences: A161495 A161496 A161497 this_sequence A161499 A161500 A161501

KEYWORD

nonn

AUTHOR

R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 11 2009

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Last modified December 1 13:27 EST 2009. Contains 167806 sequences.


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