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A121953
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a(n) = (n-2)*a(n-2)+a(n-3).
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0
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0, 1, 1, 2, 4, 9, 22, 58, 163, 486, 1525, 5023, 17261, 61801, 229416, 882475, 3503041, 14349016, 60434172, 261785329, 1162598284, 5296140752, 24676349293, 117677694828, 572852174491, 2848941025165, 14438982057103, 74645318828781
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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MATHEMATICA
| M[n_] = {{0, 1, 0}, {0, 0, 1}, {1, n, 0}} v[1] = {0, 1, 1} v[n_] := v[n] = M[n].v[n - 1] a = Table[v[n][[1]], {n, 1, 30}]
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CROSSREFS
| Cf. A001053.
Sequence in context: A176084 A192576 A059019 * A024427 A171367 A092920
Adjacent sequences: A121950 A121951 A121952 * A121954 A121955 A121956
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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. Editors of the OEIS, Oct 14 2009
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