A124135 - OEIS

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A124135

a(n)=((-1)^n/6)*sum_{i1+i2+i3+i4=2n} ((2*n)!/(i1! i2! i3! i4!))*B(i1+i2+i3) where B are the Bernoulli numbers.

0, 0, 3, 46, 1041, 32592, 1375919, 75858738, 5309829837, 460680712084, 48552875077995, 6111752613274230, 905772678574995593, 156116663818415074776, 30964395850928510817831 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	FORMULA	`a(n)=(-1)^(n+1){ (9^n/4-4^n+3/4)B(2n)+1/6}`
	PROG	`(PARI) a(n)=(-1)^(n+1)((9^n/4-4^n+3/4)bernfrac(2*n)+1/6)`
	CROSSREFS	`Sequence in context: A196137 A059624 A119401 * A193420 A000576 A128109` `Adjacent sequences: A124132 A124133 A124134 * A124136 A124137 A124138`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Nov 30 2006`

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Last modified February 14 20:13 EST 2012. Contains 205663 sequences.