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Search: id:A135583
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| 3, 8, 28, 108, 428, 1708, 6828, 27308, 109228, 436908, 1747628, 6990508, 27962028, 111848108, 447392428, 1789569708, 7158278828, 28633115308, 114532461228, 458129844908, 1832519379628, 7330077518508, 29320310074028
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OFFSET
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0,1
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FORMULA
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a(n) = (4+5*4^n)/3 . a(n)-a(n-1) = A003947(n). O.g.f.: -(-3+7*x)/[(-1+x)(-1+4*x)]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 31 2008
a(n)=-(4/3)+(13/3)*4^n, for n>=0 - Paolo P. Lava (ppl(AT)spl.at), Jun 06 2008
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CROSSREFS
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Sequence in context: A148866 A151431 A093356 this_sequence A009437 A000776 A000239
Adjacent sequences: A135580 A135581 A135582 this_sequence A135584 A135585 A135586
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KEYWORD
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nonn,easy
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Feb 25 2008
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 31 2008
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