id:A090648 - OEIS Search Results

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a(n)=2*(4^n-1)/denominator(B(2n)) where B(k) denotes the k-th Bernoulli number.

+0
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0, 1, 1, 3, 17, 31, 3, 5461, 257, 657, 6355, 60787, 12291, 22369621, 617093, 149943, 168, 43009, 5726623061, 71613, 91625968981, 162529435, 4870483401, 50991843607, 4990, 69107643, 12129927891, 34118178995231, 5664905191661 (list; graph; listen)

	OFFSET	`0,4`
	PROGRAM	`(PARI) a(n)=2(4^n-1)/denominator(bernfrac(2n))`
	CROSSREFS	`Cf. A001469.` `Adjacent sequences: A090645 A090646 A090647 this_sequence A090649 A090650 A090651` `Sequence in context: A107158 A152529 A126782 this_sequence A031024 A045437 A115355`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Dec 13 2003 Ben`

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Last modified November 9 12:23 EST 2009. Contains 166233 sequences.

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