id:A135755 - OEIS Search Results

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a(n) = Sum_{k=0..n} C(n,k)*3^[k*(k-1)/2].

+0
2

1, 2, 6, 40, 860, 63000, 14714728, 10562062112, 22960880409360, 150300904214651680, 2955814683617734854752, 174481716707875308905153664, 30905247968182392588500030233024 (list; graph; listen)

	OFFSET	`0,2`
	PROGRAM	`(PARI) {a(n)=sum(k=0, n, binomial(n, k)3^(k(k-1)/2))}`
	CROSSREFS	`Cf. variants: A006896, A135756.` `Sequence in context: A081471 A133939 A045846 this_sequence A051185 A118623 A000612` `Adjacent sequences: A135752 A135753 A135754 this_sequence A135756 A135757 A135758`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Nov 27 2007`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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