id:A110525 - OEIS Search Results

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Expansion of 1/(1-x^2*c(3x)), c(x) the g.f. A000108.

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1, 0, 1, 3, 19, 141, 1180, 10593, 99712, 971067, 9702388, 98899638, 1024429861, 10752006033, 114097140757, 1222113460332, 13195550763793, 143470913825427, 1569448022488435, 17261100136608984, 190752895126918819 (list; graph; listen)

	OFFSET	`0,4`
	COMMENT	`Diagonal sums of A110518.`
	FORMULA	`a(n)=sum{k=0..floor(n/2), (k/(n-k))C(2n-3k-1, n-2k)3^(n-2k)}`
	CROSSREFS	`Sequence in context: A027314 A025571 A082758 this_sequence A058859 A095002 A080833` `Adjacent sequences: A110522 A110523 A110524 this_sequence A110526 A110527 A110528`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jul 24 2005`

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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.

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