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A135431
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a(n)=a(n-1)+a(n-2)+a(n-3)-a(n-4) with a(0)=0, a(1)=1, a(2)=2 and a(3)=3.
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1
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0, 1, 2, 3, 6, 10, 17, 30, 51, 88, 152, 261, 450, 775, 1334, 2298, 3957, 6814, 11735, 20208, 34800, 59929, 103202, 177723, 306054, 527050, 907625, 1563006, 2691627, 4635208, 7982216, 13746045, 23671842, 40764895, 70200566, 120891258, 208184877, 358511806
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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FORMULA
| O.g.f.: x*(1+x)/(1-x-x^2-x^3+x^4) . a(n)=A116732(n+1)+A116732(n+2). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 31 2008
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MATHEMATICA
| LinearRecurrence[{1, 1, 1, -1}, {0, 1, 2, 3}, 40] (* From Vladimir Joseph Stephan Orlovsky, Feb 03 2012 *)
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CROSSREFS
| Sequence in context: A026669 A023614 A001610 * A123908 A026397 A193200
Adjacent sequences: A135428 A135429 A135430 * A135432 A135433 A135434
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KEYWORD
| nonn,changed
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AUTHOR
| Mohamed Bouhamida (bhmd95(AT)yahoo.fr), Dec 13 2007
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