id:A116396 - OEIS Search Results

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

+0
2

1, 2, 7, 25, 93, 353, 1358, 5273, 20614, 81003, 319584, 1264924, 5019743, 19963699, 79541181, 317406302, 1268283199, 5073605801, 20316709251, 81427911966, 326612013623, 1310968893954, 5265285993860, 21158914176719, 85071253608611 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Diagonal sums of number triangle A116395.`
	FORMULA	`a(n)=sum{k=0..floor(n/2), (4^(n-k)/2^k)*sum{j=0..k, C(k,j)C(n-k+(j-1)/2,n-k)(-1)^(k-j)}}.`
	CROSSREFS	`Sequence in context: A024482 A074605 A108081 this_sequence A150453 A150454 A150455` `Adjacent sequences: A116393 A116394 A116395 this_sequence A116397 A116398 A116399`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 12 2006`

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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.

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