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Search: id:A112685
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| 1, 1, 1, 7, 7, 37, 49, 199, 319, 1093, 1993, 6103, 12151, 34501, 72961, 196807, 433807, 1129957, 2562649, 6517399, 15073159, 37712293, 88400593, 218707783, 517427551, 1270340101, 3024553321, 7386555607, 17663446807, 42981884677, 103090345249
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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Last digit has period 12.
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FORMULA
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Differences: 0, 0, 6, 0, 30, 12, 150, 120, 774 ... = 6*A135138.
O.g.f.: (-1-x+4*x^2)/{(2*x+1)(x^2+2*x-1)} . a(n) = [(-2)^(n+1)+9*A000129(n+1)-15*A000129(n)]/7. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 17 2008
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CROSSREFS
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Sequence in context: A095343 A121210 A154702 this_sequence A153721 A151791 A022667
Adjacent sequences: A112682 A112683 A112684 this_sequence A112686 A112687 A112688
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Mar 02 2008
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 17 2008
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