id:A032109 - OEIS Search Results

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"BIJ" (reversible, indistinct, labeled) transform of 1,1,1,1...

+0
2

1, 1, 2, 7, 38, 271, 2342, 23647, 272918, 3543631, 51123782, 811316287, 14045783798, 263429174191, 5320671485222, 115141595488927, 2657827340990678, 65185383514567951, 1692767331628422662 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`C. G. Bower, Transforms (2)`
	FORMULA	`E.g.f.: (e^(2x)-2e^x-1)/(2*e^x-4).` `a(n) = (A000670(n)+1)/2. - Vladeta Jovovic (vladeta(AT)Eunet.yu), Apr 13 2003`
	PROGRAM	`(PARI) a(n)=if(n<0, 0, n!polcoeff(subst((1-y^2/2)/(1-y), y, exp(x+xO(x^n))-1), n))`
	CROSSREFS	`A052856(n)=2*a(n), if n>0.` `Sequence in context: A102743 A036432 A094431 this_sequence A088792 A114160 A084552` `Adjacent sequences: A032106 A032107 A032108 this_sequence A032110 A032111 A032112`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net)`

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Last modified July 8 18:40 EDT 2008. Contains 141013 sequences.

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