id:A128058 - OEIS Search Results

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Expansion of 1/((1-x)sqrt(1-2x+5x^2)).

+0
3

1, 2, 1, -4, -9, 2, 43, 72, -53, -418, -549, 860, 4161, 4006, -11619, -41104, -24989, 145046, 399571, 89796, -1723259, -3787914, 829841, 19739016, 34642741, -26909998, -219300587, -300591148, 467328447, 2369124842 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Partial sums of A098331. Binomial transform of A128057. Hankel transform is A128056.`
	FORMULA	`a(n)=sum{k=0..n, sum{j=0..k, C(k,j)C(k-j,j)(-1)^j}}`
	CROSSREFS	`Adjacent sequences: A128055 A128056 A128057 this_sequence A128059 A128060 A128061` `Sequence in context: A120458 A086933 A077878 this_sequence A077160 A057046 A015943`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 13 2007`

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Last modified October 7 08:31 EDT 2008. Contains 144667 sequences.

AT&T Labs Research