id:A114633 - OEIS Search Results

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a(n) = (n+1)*(n+2)/2*sum(k=0,floor(n/2),n!/(n-2*k)! ).

+0
30

1, 3, 18, 70, 555, 2961, 31108, 213228, 2799765, 23455135, 369569046, 3659001138, 67261566463, 768390239085, 16142775951240, 209002145031256, 4939689441079593, 71478733600689723 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Formula were found by Paul D. Hanna. Related to logarithmic numbers A002104.`
	FORMULA	`a(n) = A087208(n)(n+1)(n+2)/2 (Hanna)`
	MAPLE	`a := n -> (n+1)(n+2)/2sum(n!/(n-2*k)!, k=0..floor(n/2));`
	CROSSREFS	`Cf. A087208, A002104.` `Sequence in context: A048899 A107583 A098522 this_sequence A135070 A073961 A059393` `Adjacent sequences: A114630 A114631 A114632 this_sequence A114634 A114635 A114636`
	KEYWORD	`nonn`
	AUTHOR	`Creighton Dement (creighton.k.dement(AT)uni-oldenburg.de), Feb 17 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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