id:A154890 - OEIS Search Results

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Jacobsthal numbers A001045 alternatingly incremented by 3 and 5.

+0
3

3, 6, 4, 8, 8, 16, 24, 48, 88, 176, 344, 688, 1368, 2736, 5464, 10928, 21848, 43696, 87384, 174768, 349528, 699056, 1398104, 2796208, 5592408, 11184816, 22369624, 44739248, 89478488, 178956976, 357913944, 715827888, 1431655768, 2863311536, 5726623064 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`a(2n+1) = 2a(2n).` `a(n) = A153643(n)+A010684(n).` `a(n+2) = 4A128209(n).` `a(n) = 2a(n-1)+a(n-2)-2a(n-3). G.f.: (3-11x^2)/((1-x)(1+x)(1-2x)). [R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 23 2009]`
	CROSSREFS	`Sequence in context: A093064 A136612 A004546 this_sequence A100000 A083682 A021278` `Adjacent sequences: A154887 A154888 A154889 this_sequence A154891 A154892 A154893`
	KEYWORD	`nonn,easy`
	AUTHOR	`Paul Curtz (bpcrtz(AT)free.fr), Jan 17 2009`
	EXTENSIONS	`Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 23 2009`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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