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A085110
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a(1) =1, then add 1 multiply by 2 to get a(2), subtract 1 and multiply by 3 to get a(3), add 1 and multiply by 4 to get a(4) and so on.
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1, 4, 9, 40, 195, 1176, 8225, 65808, 592263, 5922640, 65149029, 846937390, 11857123446, 177856851705, 2845709627264, 48377063663505, 870787145943072, 16544955772918387, 330899115458367720, 6948881424625722141
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(1)=1, a(n)=n*a(n-1)+(-1)^n*n ; a(n)=round(n!*(2-exp(-1)))+(-1)^n - Benoit Cloitre (abmt(AT)orange.fr), Sep 24 2006
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PROG
| (PARI) a(n)=if(n<2, 1, n*a(n-1)+(-1)^n*n) - Benoit Cloitre (abmt(AT)orange.fr), Sep 24 2006
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CROSSREFS
| Sequence in context: A149163 A149164 A073414 * A013459 A041229 A042887
Adjacent sequences: A085107 A085108 A085109 * A085111 A085112 A085113
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 04 2003
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EXTENSIONS
| More terms from Sam Alexander (amnalexander(AT)yahoo.com), Feb 26 2004
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