id:A128209 - OEIS Search Results

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Jacobsthal numbers(A001045)+1.

+0
7

1, 2, 2, 4, 6, 12, 22, 44, 86, 172, 342, 684, 1366, 2732, 5462, 10924, 21846, 43692, 87382, 174764, 349526, 699052, 1398102, 2796204, 5592406, 11184812, 22369622, 44739244, 89478486 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Row sums of A128208.` `Essentially the same as A052953. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 14 2008`
	FORMULA	`G.f.:(1-3x^2)/(1-2x-x^2+2*x^3); a(n)=1+2^n/3-(-1)^n/3;`
	CROSSREFS	`Cf. A167030, A153643 [Paul Curtz (bpcrtz(AT)free.fr), Oct 29 2009]` `Sequence in context: A063886 A003000 A122536 this_sequence A052953 A153955 A074028` `Adjacent sequences: A128206 A128207 A128208 this_sequence A128210 A128211 A128212`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 19 2007`

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

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