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A053817
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a(0)=1 and a(n)=n*(a(n-1)+n).
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0
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1, 2, 8, 33, 148, 765, 4626, 32431, 259512, 2335689, 23356990, 256927011, 3083124276, 40080615757, 561128620794, 8416929312135, 134670868994416, 2289404772905361, 41209285912296822, 782976432333639979
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n) = A030297(n)+n! = A019460(2n+1)-n - Henry Bottomley (se16(AT)btinternet.com), Nov 10 2000.
a(n)= n! + floor(2*e*n!-n)-2, n>1 [From Gary Detlefs (gdetlefs(AT)aol.com), Jun 22 2010]
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EXAMPLE
| Start with 1, add 1, multiply by 1 (getting 2), add 2, multiply by 2 (getting 8).
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MATHEMATICA
| a=1; lst={a}; Do[a=(a+n)*n; AppendTo[lst, a], {n, 2*4!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Dec 14 2008]
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CROSSREFS
| Sequence in context: A150879 A150880 A150881 * A150882 A150883 A150884
Adjacent sequences: A053814 A053815 A053816 * A053818 A053819 A053820
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KEYWORD
| nonn,easy,nice
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AUTHOR
| mindy and steve schwartz (minsteve(AT)netvision.net.il), Apr 07 2000
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EXTENSIONS
| More terms from James A. Sellers (sellersj(AT)math.psu.edu), Apr 08 2000
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