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A006523 Sum ((-1)^(i+1)*binomial(n,i)*2^i*(2*n-1)!,i=1..n) for n odd. 0

%I

%S 2,240,725760,12454041600,711374856192000,102181884343418880000,

%T 31022420086661971968000000,17683523987479403909087232000000,

%U 17366635237623772991036388802560000000

%N Sum ((-1)^(i+1)*binomial(n,i)*2^i*(2*n-1)!,i=1..n) for n odd.

%K nonn

%O 1,1

%A _N. J. A. Sloane_.

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Last modified May 18 19:58 EDT 2021. Contains 344002 sequences. (Running on oeis4.)