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Search: id:A056543
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| A056543 |
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a(n) = n*a(n-1) - 1 with a(1)=1. |
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+0
3
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| 1, 1, 2, 7, 34, 203, 1420, 11359, 102230, 1022299, 11245288, 134943455, 1754264914, 24559708795, 368395631924, 5894330110783, 100203611883310, 1803665013899579, 34269635264092000, 685392705281839999
(list; graph; listen)
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OFFSET
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1,3
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FORMULA
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a(n) =ceiling[(3-e)*n! ] =n!-A056542(n) =2*n!-A002627(n) =3*n!-A000522(n)
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EXAMPLE
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a(4)=4*a(3)-1=4*2-1=7
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MATHEMATICA
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lst={1}; s=-1; Do[s+=s++n; AppendTo[lst, Abs[s]], {n, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Oct 23 2008]
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CROSSREFS
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Sequence in context: A020054 A117399 A145345 this_sequence A075834 A011800 A112916
Adjacent sequences: A056540 A056541 A056542 this_sequence A056544 A056545 A056546
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KEYWORD
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easy,nonn
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AUTHOR
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Henry Bottomley (se16(AT)btinternet.com), Jun 20 2000
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), Jul 04 2000
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