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A105926
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First differences of A000166.
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0
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-1, 1, 1, 7, 35, 221, 1589, 12979, 118663, 1201465, 13349609, 161530271, 2114578091, 29780308117, 448995414685, 7215997736011, 123153028027919, 2224451568754289, 42395429898611153, 850263899633257015, 17900292623858042419
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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MAPLE
| a:=n->sum((-1)^k * (n-k-1) * n!/k!, k=0..n): seq(a(n), n=0..20); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 27 2007
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MATHEMATICA
| Table[Subfactorial[n] - Subfactorial[n - 1], {n, 1, 22}] [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jul 09 2009]
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CROSSREFS
| Sequence in context: A026157 A025184 A177261 * A184460 A096686 A165505
Adjacent sequences: A105923 A105924 A105925 * A105927 A105928 A105929
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KEYWORD
| sign
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Apr 27 2005
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