id:A115962 - OEIS Search Results

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Expansion of 1/sqrt(1-4x^2-4x^3).

+0
3

1, 0, 2, 2, 6, 12, 26, 60, 130, 300, 672, 1540, 3514, 8064, 18552, 42756, 98802, 228624, 530024, 1230372, 2860000, 6655792, 15505932, 36159552, 84398626, 197154984, 460903796, 1078251044, 2524144224, 5912535672, 13857378300, 32495267712 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Diagonal sums of number triangle A115951.`
	FORMULA	`a(n)=sum{k=0..floor(n/2), C(2k,k)*C(k,n-2k)}.`
	CROSSREFS	`Adjacent sequences: A115959 A115960 A115961 this_sequence A115963 A115964 A115965` `Sequence in context: A079005 A054481 A035615 this_sequence A019311 A052994 A088219`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 14 2006`

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Last modified October 7 14:39 EDT 2008. Contains 144666 sequences.

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