id:A135756 - OEIS Search Results

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

+0
2

1, 2, 7, 80, 4381, 1069742, 1080096067, 4405584869660, 72092808533798521, 4723015159635987920282, 1237987266193328694390243007, 1298087832233881093828346620725800 (list; graph; listen)

	OFFSET	`0,2`
	PROGRAM	`(PARI) {a(n)=sum(k=0, n, binomial(n, k)2^(k(k-1)))}`
	CROSSREFS	`Cf. variants: A006896, A135755.` `Sequence in context: A042791 A128293 A071409 this_sequence A111822 A062764 A163855` `Adjacent sequences: A135753 A135754 A135755 this_sequence A135757 A135758 A135759`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Nov 27 2007`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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