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A106805
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G.f.: 1 / (1-2x-x^2-x^3).
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0
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1, 2, 5, 11, 25, 56, 126, 283, 636, 1429, 3211, 7215, 16212, 36428, 81853, 183922, 413269, 928607, 2086561, 4688460, 10534874, 23671647, 53189708, 119516189, 268550439, 603427359, 1355888968, 3046654856, 6845771321, 15382308530, 34563733525, 77664004259
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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MATHEMATICA
| M = {{0, 0, 1}, {1, 2, 0}, {1, 1, 0}}; Det[M - x*IdentityMatrix[3]] v[0] = {0, 1, 1} v[n_]: = v[n]=M.v[n - 1] a = Table[v[n][[2]], {n, 0, 50}]
LinearRecurrence[{2, 1, -1}, {1, 2, 5}, 60] (* From Vladimir Joseph Stephan Orlovsky, Feb 13 2012 *)
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CROSSREFS
| A006054 shifted left twice.
Sequence in context: A017919 A017920 A006054 * A094981 A097779 A106336
Adjacent sequences: A106802 A106803 A106804 * A106806 A106807 A106808
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KEYWORD
| nonn,changed
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AUTHOR
| Roger L. Bagula (rlbagulatftn(AT)yahoo.com), May 17 2005
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EXTENSIONS
| Edited by the Associate Editors of the OEIS, Apr 09 2009
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