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A121956
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a(n) = a(n-1)+(n-3)*a(n-2)+a(n-3) starting a(0)=0, a(1)=a(2)=1.
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0
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0, 1, 1, 2, 5, 12, 34, 99, 315, 1042, 3661, 13354, 51006, 201561, 826987, 3498286, 15277665, 68578942, 316519868, 1497639547, 7263576113, 36035247374, 182804409181, 946808180148, 5004540429504, 26963932982089, 148019711470333
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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MATHEMATICA
| M = {{0, 1, 0}, {0, 0, 1}, {1, n, 1}}; v[0] = {0, 1, 1}; v[n_] := v[n] = M.v[n - 1] a = Table[v[n][[1]], {n, 0, 30}]
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CROSSREFS
| Sequence in context: A196545 A032292 A151408 * A176638 A131467 A000103
Adjacent sequences: A121953 A121954 A121955 * A121957 A121958 A121959
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KEYWORD
| nonn
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AUTHOR
| Roger Bagula (rlbagulatftn(AT)yahoo.com), Sep 01 2006
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EXTENSIONS
| Definition replaced by recurrence - the Assoc. Eds. of the OEIS, Mar 27 2010
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