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Search: id:A134987
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| A134987 |
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Third extended Jacobsthal recurrence: a(n)=4a(n-1)-6(n-2)+4a(n-3)-a(n-4)+2a(n-5). |
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+0
1
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| 0, 0, 0, 0, 1, 4, 10, 20, 35, 58, 100, 192, 405, 880
(list; graph; listen)
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OFFSET
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0,6
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COMMENT
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See A134658. Sequence is identical to half its fourth differences from second term.
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FORMULA
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O.g.f.: -1/[9(2x-1)]+(-4x^3-2x^2-1)/[9(x^4+2x^2-2x+1)]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 06 2008
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CROSSREFS
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Sequence in context: A034223 A139748 A137359 this_sequence A058539 A008112 A038410
Adjacent sequences: A134984 A134985 A134986 this_sequence A134988 A134989 A134990
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Feb 05 2008
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