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Search: id:A108984
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| 1, 8, 55, 386, 2701, 18908, 132355, 926486, 6485401, 45397808, 317784655, 2224492586, 15571448101, 109000136708, 763000956955, 5341006698686, 37387046890801, 261709328235608, 1831965297649255, 12823757083544786
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OFFSET
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0,2
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FORMULA
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a(n) = 6a(n-1) + 7a(n-2), a(0) = 1, a(1) = 8.
a(2n) = 7a(2n-1) - 1; a(2n+1) = 7a(2n) + 1.
O.g.f.: -(1+2x)/[(1+x)(7x-1)]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 02 2008
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CROSSREFS
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Adjacent sequences: A108981 A108982 A108983 this_sequence A108985 A108986 A108987
Sequence in context: A010924 A010918 A019484 this_sequence A003722 A044146 A118772
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KEYWORD
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nonn
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Jul 23 20050
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 02 2008
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