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Search: id:A091339
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| A091339 |
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a(n) = a(n-1)*a(n-2) + (n-2); a(1) = 1, a(2) = 2. |
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+0
1
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| 1, 2, 3, 8, 27, 220, 5945, 1307906, 7775501177, 10169624642405370, 79073928376671158546120499, 804152170591192270227367107671577224679640, 63587471141272584754077292003976884470033921630214659882200111940371
(list; graph; listen)
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OFFSET
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1,2
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MATHEMATICA
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a[1] = 1; a[2] = 2; a[n_] := a[n - 1]a[n - 2] + n - 2; Table[ a[n], {n, 13}] (from Robert G. Wilson v Dec 10 2004)
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CROSSREFS
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Sequence in context: A121401 A093858 A080568 this_sequence A006277 A004106 A012886
Adjacent sequences: A091336 A091337 A091338 this_sequence A091340 A091341 A091342
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KEYWORD
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nonn,easy
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AUTHOR
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Martti V. A. Holopainen (martti.holopainen(AT)pp2.inet.fi), Dec 06 2004
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 10 2004
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