id:A076552 - OEIS Search Results

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a(n)=(-1)^(n+1)/3/(2n+1)*sum(k=0,n,16^k*B(2k)*C(2n+1,2k)) where B(k) denotes the k-th Bernoulli number.

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1, 1, 21, 461, 16841, 900921, 66453661, 6463837381, 801626558481, 123457062745841, 23116291464379301, 5171511387852362301, 1362357503097707964121, 417419880467876621822761 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`Terms are of form 10k+1`
	PROGRAM	`(PARI) a(n)=(-1)^(n+1)/3/(2n+1)sum(k=0, n, 16^kbernfrac(2k)binomial(2n+1, 2*k))`
	CROSSREFS	`Sequence in context: A009965 A041842 A157014 this_sequence A126996 A158603 A025603` `Adjacent sequences: A076549 A076550 A076551 this_sequence A076553 A076554 A076555`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Oct 19 2002`

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

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