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Search: id:A141685
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| A141685 |
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An Invert transform sequence of the form: a(n)=Sun[Mod[k,3]*a(n-k),{k,1,n}]. |
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1
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| 1, 1, 3, 5, 12, 25, 54, 116, 249, 535, 1149, 2468, 5301, 11386, 24456, 52529, 112827, 242341, 520524, 1118033, 2401422, 5158012, 11078889, 23796335, 51112125, 109783684, 235804269, 506483762, 1087875984, 2336647777, 5018883507
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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Limit[a(n+1)/a(n),n->Infinity]=2.1478990357047874
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FORMULA
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a(n)=Sun[Mod[k,3]*a(n-k),{k,1,n}].
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MATHEMATICA
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a[0] = 1; a[n_] := a[n] = Sum[Mod[k, 3]*a[n - k], {k, 1, n}]; Table[a[n], {n, 0, 30}]
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CROSSREFS
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Sequence in context: A030270 A129757 A135019 this_sequence A017921 A161762 A005913
Adjacent sequences: A141682 A141683 A141684 this_sequence A141686 A141687 A141688
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KEYWORD
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nonn,uned
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AUTHOR
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Roger L. Bagula and Gary W. Adamson (rlbagulatftn(AT)yahoo.com), Sep 08 2008
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