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Search: id:A111063
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| A111063 |
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a(0) = 1; a(n) = (n-1)*a(n-1)+n. |
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+0
1
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| 1, 1, 3, 9, 31, 129, 651, 3913, 27399, 219201, 1972819, 19728201, 217010223, 2604122689, 33853594971, 473950329609, 7109254944151, 113748079106433, 1933717344809379, 34806912206568841, 661331331924807999, 13226626638496160001, 277759159408419360043
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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a(n+1)=sum{k=0..2n, C(n,floor(k/2))(n-floor(k/2))!}; - Paul Barry (pbarry(AT)wit.ie), May 04 2007
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MAPLE
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a:=proc(n) option remember; if n=0 then RETURN(1); fi; (n-1)*a(n-1)+n; end;
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CROSSREFS
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A030297(n)/n, n>0.
Sequence in context: A071603 A090595 A027040 this_sequence A089475 A099999 A039749
Adjacent sequences: A111060 A111061 A111062 this_sequence A111064 A111065 A111066
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Oct 08 2005
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