id:A105872 - OEIS Search Results

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Diagonal sums of A092392, as a number triangle.

+0
2

1, 2, 6, 21, 75, 273, 1009, 3770, 14202, 53846, 205216, 785460, 3017106, 11624580, 44905518, 173863965, 674506059, 2621371005, 10203609597, 39773263035, 155231706951, 606554343495, 2372544034143, 9289131196485, 36401388236461 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=sum{k=0..floor(n/2), C(2n-3k, n)}`
	CROSSREFS	`Sequence in context: A116751 A116823 A116743 this_sequence A148490 A006612 A116769` `Adjacent sequences: A105869 A105870 A105871 this_sequence A105873 A105874 A105875`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Apr 23 2005`

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Last modified December 19 21:04 EST 2009. Contains 171054 sequences.

AT&T Labs Research