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%I #7 May 22 2013 16:15:43
%S 0,24,480,40320,2903040,479001600,74724249600,20922789888000,
%T 5690998849536000,2432902008176640000,1021818843434188800000,
%U 620448401733239439360000,372269041039943663616000000
%N (2*n)!-Sum ((-1)^(i+1)*binomial(n,i)*2^i*(2*n-1)!,i=1..n).
%F 4*floor(n/2) * (2n-1)!. - _Ralf Stephan_, Mar 08 2004
%K nonn
%O 1,2
%A _N. J. A. Sloane_.
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