id:A108480 - OEIS Search Results

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

+0
2

1, 1, 3, 13, 35, 117, 379, 1197, 3859, 12357, 39563, 126845, 406371, 1302101, 4172443, 13369293, 42838835, 137266917, 439837739, 1409354397, 4515934339, 14470215157, 46366299963, 148569565165, 476055153491, 1525403341701 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n)=2a(n-1)+3a(n-2)+4a(n-3)-4a(n-4); a(n)=sum{k=0..floor(n/2), C(2(n-k), 2k)2^k}.`
	CROSSREFS	`Sequence in context: A137976 A095661 A058214 this_sequence A061483 A128288 A113115` `Adjacent sequences: A108477 A108478 A108479 this_sequence A108481 A108482 A108483`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jun 04 2005`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

AT&T Labs Research