id:A110137 - OEIS Search Results

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Diagonal sums of A110135 when read as a number triangle.

+0
2

1, 2, 7, 22, 79, 286, 1071, 4070, 15721, 61506, 243703, 977366, 3968169, 16313842, 67942539, 286769518, 1227194947, 5326324598, 23451408843, 104753097326, 474663076539, 2181355670806, 10163422480887, 47988508807190 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n)=sum{j=0..floor((n-2k)/2), C(n-2k, j)C(2(n-2k-j), n-2k)k^j}`
	CROSSREFS	`Sequence in context: A106188 A132838 A047095 this_sequence A097967 A052879 A007867` `Adjacent sequences: A110134 A110135 A110136 this_sequence A110138 A110139 A110140`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jul 13 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research