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A067273
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a(n)=n*(a(n-1)*2+1), a(0)=0.
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1
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0, 1, 6, 39, 316, 3165, 37986, 531811, 8508984, 153161721, 3063234430, 67391157471, 1617387779316, 42052082262229, 1177458303342426, 35323749100272795, 1130359971208729456, 38432239021096801521
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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FORMULA
| E.g.f.: x*exp(x)/(1-2*x). a(n) = n!*Sum_{k=1..n} 2^(k-1)/(n-k)! = n*A010844(n-1). - Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 09 2003
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MATHEMATICA
| s=1; lst={}; Do[s+=(s*=n)-n; AppendTo[lst, Abs[s]], {n, 0, 5!, 1}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 15 2008]
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CROSSREFS
| Cf. A007526.
Sequence in context: A103194 A009018 A135890 * A187117 A137972 A007322
Adjacent sequences: A067270 A067271 A067272 * A067274 A067275 A067276
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KEYWORD
| nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 21 2002
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EXTENSIONS
| More terms and Mathematica program Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 15 2008
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