id:A117439 - OEIS Search Results

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

+0
2

1, 4, 17, 76, 337, 1496, 6641, 29480, 130865, 580924, 2578785, 11447508, 50816737, 225581040, 1001378849, 4445229968, 19732860833, 87596322228, 388849631729, 1726145941404, 7662550168241, 34014896233544, 150995835638929 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Row sums of unsigned version of number triangle A117438.`
	FORMULA	`a(n)=4a(n-1)+2a(n-2)-a(n-4); a(n)=sum{k=0..floor(n/2), C(2n-3k,k)4^(n-2)}.`
	CROSSREFS	`Sequence in context: A026751 A081568 A026378 this_sequence A081910 A026773 A081186` `Adjacent sequences: A117436 A117437 A117438 this_sequence A117440 A117441 A117442`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 16 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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