id:A132304 - OEIS Search Results

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Sum of fourth powers of trinomial coefficients: a(n) = Sum_{k=0..2n} trinomial(n,k)^4 where trinomial(n,k) = [x^k] (1 + x + x^2)^n.

+0
3

1, 3, 115, 5157, 281907, 16688953, 1043460469, 67769148555, 4527813298227, 309207348577017, 21487099512128265, 1514508365575327455, 108015601963868232885, 7780760215720406500095, 565264860408377433558523 (list; graph; listen)

	OFFSET	`0,2`
	PROGRAM	`(PARI) a(n)=sum(k=0, 2*n, polcoeff((1+x+x^2)^n, k)^4)`
	CROSSREFS	`Cf. A132303, A132305.` `Sequence in context: A139929 A142603 A065117 this_sequence A097642 A009095 A037117` `Adjacent sequences: A132301 A132302 A132303 this_sequence A132305 A132306 A132307`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Aug 18 2007`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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