id:A108478 - OEIS Search Results

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Diagonal sums of number triangle A108477.

+0
2

1, 1, 2, 14, 43, 127, 468, 1596, 5253, 17917, 60918, 205194, 694287, 2351611, 7951336, 26894840, 91004105, 307854073, 1041410602, 3523170438, 11918842803, 40320750711, 136404504124, 461454010164, 1561085306061, 5281113937653 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n)=sum{k=0..floor(n/2), sum{j=0..n-k, C(2(n-2k), j)C(2k, j)2^j}}.`
	CROSSREFS	`Adjacent sequences: A108475 A108476 A108477 this_sequence A108479 A108480 A108481` `Sequence in context: A009368 A092344 A109137 this_sequence A075036 A091405 A085929`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jun 04 2005`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

AT&T Labs Research