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A120260

Diagonal sums of number triangle A120258.

+0
2

1, 1, 2, 3, 8, 24, 92, 432, 2740, 23822, 264185, 3545166, 59474514, 1343942004, 41179884383, 1593533376361, 74665098131246, 4404743069577837, 351138858279113987, 37740395752334771775, 5093113605218543006445 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n)=sum{k=0..floor(n/2), Product{j=0..k-1, C(2n-4k+j, n-2k)/C(n-2k+j, j)}}`
	CROSSREFS	`Adjacent sequences: A120257 A120258 A120259 this_sequence A120261 A120262 A120263` `Sequence in context: A089847 A038561 A055981 this_sequence A002619 A129202 A127905`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jun 13 2006`

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Last modified October 13 17:46 EDT 2008. Contains 145008 sequences.

AT&T Labs Research