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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
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0, 0, 0, 0, 1, 4, 10, 20, 35, 58, 100, 192, 405, 880, 1874, 3844, 7631, 14886, 29020, 57192, 114249, 230300, 465226, 936948, 1877771, 3748498, 7470532, 14895728, 29749837, 59514152, 119166962, 238627620, 477606935, 955315390, 1909991772, 3818208792
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,6
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COMMENTS
| See A134658. Sequence is identical to half its fourth differences from second term.
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FORMULA
| 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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MATHEMATICA
| LinearRecurrence[{4, -6, 4, -1, 2}, {0, 0, 0, 0, 1}, 60] (* From Harvey P. Dale, Jul 12 2011 *)
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CROSSREFS
| Sequence in context: A034223 A139748 A137359 * A058539 A008112 A038410
Adjacent sequences: A134984 A134985 A134986 * A134988 A134989 A134990
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KEYWORD
| nonn
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Feb 05 2008
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EXTENSIONS
| More terms from Harvey P. Dale, Jul 12 2011
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