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A121810
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a(n) = a(n - 1)*a(n - 2) + a(n - 2)*a(n - 3) + a(n - 1)*a(n - 3).
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0
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0, 1, 1, 1, 3, 7, 31, 331, 12795, 4642051, 60935796571, 283646808320375611, 17285560913056915909539455163, 4902995236325455290013100337511909917402705547
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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COMMENTS
| Essentially the same as A074047. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 07 2008]
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MATHEMATICA
| a[0] = 0; a[1] = 1; a[2] = 1; a[n_] := a[n] = a[n - 1]*a[n - 2] + a[n - 2]*a[n - 3] + a[n - 1]*a[n - 3] Table[a[n], {n, 0, 15}]
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CROSSREFS
| Sequence in context: A063896 A156895 A074047 * A081475 A123212 A070231
Adjacent sequences: A121807 A121808 A121809 * A121811 A121812 A121813
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KEYWORD
| nonn
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AUTHOR
| Roger Bagula (rlbagulatftn(AT)yahoo.com), Aug 30 2006
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EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Oct 08 2006
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