id:A098588 - OEIS Search Results

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a(n)=2a(n-1)+a(n-5).

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1, 2, 4, 8, 16, 33, 68, 140, 288, 592, 1217, 2502, 5144, 10576, 21744, 44705, 91912, 188968, 388512, 798768, 1642241, 3376394, 6941756, 14272024, 29342816, 60327873, 124032140, 255006036, 524284096, 1077911008, 2216149889 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: 1/(1-2x-x^5); a(n)=sum{k=0..floor(n/4), sum{i=0..n, binomial(n-4k, i)binomial(i, k)}}.`
	CROSSREFS	`Cf. A008998, A008999.` `Sequence in context: A036373 A119610 A121485 this_sequence A126683 A005821 A004149` `Adjacent sequences: A098585 A098586 A098587 this_sequence A098589 A098590 A098591`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 16 2004`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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