Search: id:A061640
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%I A061640
%S A061640 0,1,4,24,240,4080,110880,4404960,238452480,16777393920,1484592883200,
%T A061640 161180605555200,21054378333542400,3256459844769331200,
%U A061640 588451470437627596800,122827588904844375552000
%N A061640 !n*n!.
%H A061640 Harry J. Smith, <a href="b061640.txt">Table of n, a(n) for n=0,...,100</
               a>
%F A061640 a(n) = A000142(n)*A003422(n).
%p A061640 a:=n->sum((n+1)!*j!,j=0..n): seq(a(n), n=-1..15); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), 
               Jan 08 2007
%o A061640 (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]
%Y A061640 Cf. A000142 A003422.
%Y A061640 Cf. A000142, A003422.
%Y A061640 Sequence in context: A034256 A074598 A052718 this_sequence A126391 A006088 
               A141013
%Y A061640 Adjacent sequences: A061637 A061638 A061639 this_sequence A061641 A061642 
               A061643
%K A061640 easy,nonn
%O A061640 0,3
%A A061640 Jason Earls (zevi_35711(AT)yahoo.com), Jun 13 2001
%E A061640 More terms from Larry Reeves (larryr(AT)acm.org), Jun 19 2001

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