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Search: id:A061640
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| 0, 1, 4, 24, 240, 4080, 110880, 4404960, 238452480, 16777393920, 1484592883200, 161180605555200, 21054378333542400, 3256459844769331200, 588451470437627596800, 122827588904844375552000
(list; graph; listen)
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OFFSET
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0,3
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0,...,100
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FORMULA
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a(n) = A000142(n)*A003422(n).
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MAPLE
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a:=n->sum((n+1)!*j!, j=0..n): seq(a(n), n=-1..15); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 08 2007
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PROGRAM
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(PARI) { for (n=0, 100, L=sum(k=0, n-1, k!); write("b061640.txt", n " ", L*n!) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 25 2009]
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CROSSREFS
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Cf. A000142 A003422.
Cf. A000142, A003422.
Adjacent sequences: A061637 A061638 A061639 this_sequence A061641 A061642 A061643
Sequence in context: A034256 A074598 A052718 this_sequence A126391 A006088 A141013
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KEYWORD
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easy,nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Jun 13 2001
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EXTENSIONS
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More terms from Larry Reeves (larryr(AT)acm.org), Jun 19 2001
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