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0, 0, 1, 2, 3, 6, 15, 30, 55, 110, 231, 462, 903, 1806, 3655, 7310, 14535, 29070, 58311, 116622, 232903, 465806, 932295, 1864590, 3727815, 7455630, 14913991, 29827982, 59650503
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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FORMULA
| O.g.f.: x^2/((2*x-1)(x-1)(1+x)(1+2*x^2)). a(2n) = A084175(n). a(2n+1)=2*A084175(n). a(n) = 2a(n-1) -a(n-2) +2a(n-3) +2a(n-4) -4a(n-5). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 19 2008
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CROSSREFS
| Sequence in context: A081945 A158027 A100249 * A052102 A053561 A147773
Adjacent sequences: A138474 A138475 A138476 * A138478 A138479 A138480
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KEYWORD
| nonn
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), May 18 2008
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 19 2008
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