id:A107029 - OEIS Search Results

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Diagonal sums of number triangle A107027.

+0
2

1, 1, 3, 3, 5, 7, 11, 19, 35, 69, 151, 339, 829, 2111, 5607, 15737, 45289, 136477, 423279, 1353671, 4471673, 15114479, 52605755, 187162155, 681817179, 2539492249, 9646349779, 37415172217, 147745308403, 594368656811 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n)=sum{k=0..floor(n/2), (n-2k-1)C((n-2k)k, k)-(n-2k-2)sum{j=0..k, C((n-2k)*k, j)}}`
	CROSSREFS	`Sequence in context: A128424 A129758 A001588 this_sequence A123632 A039868 A015723` `Adjacent sequences: A107026 A107027 A107028 this_sequence A107030 A107031 A107032`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), May 09 2005`

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Last modified July 23 17:35 EDT 2008. Contains 142285 sequences.

AT&T Labs Research