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A132960
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a(n) = n!*Sum_{d|n} (-1)^(d+1)/(d!*(n/d)^d).
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6
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1, 0, 3, 2, 25, 94, 721, 3674, 42561, 291248, 3628801, 34254604, 479001601, 5337581534, 88966701825, 1140807642974, 20922789888001, 321094542593824, 6402373705728001, 109338195253235948, 2457732174030848001
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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FORMULA
| E.g.f.: Sum_{k>0}(1-exp(-x^k/k)).
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MATHEMATICA
| Rest[ Range[0, 22]! CoefficientList[ Series[ - Sum[ Exp[ -x^k/k], {k, 25}], {x, 0, 22}], x]] - Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 13 2007
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CROSSREFS
| Cf. A005225, A132958, A132959, A132961, A132962, A132963.
Sequence in context: A165714 A090883 A100645 * A009574 A059422 A102056
Adjacent sequences: A132957 A132958 A132959 * A132961 A132962 A132963
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KEYWORD
| easy,nonn
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 06 2007
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EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 13 2007
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