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%I A122685 #15 Oct 21 2018 12:56:36
%S A122685 1,1,-2,6,0,120,0,5040,0,362880,0,39916800,0,6227020800,0,
%T A122685 1307674368000,0,355687428096000,0,121645100408832000,0,
%U A122685 51090942171709440000,0,25852016738884976640000,0,15511210043330985984000000,0,10888869450418352160768000000,0,8841761993739701954543616000000
%N A122685 a(n) = n! except that a(2) = -2 and a(2n) = 0 for n > 2.
%C A122685 Same as A005212 for n > 2. - _Georg Fischer_, Oct 21 2018
%Y A122685 Cf. A005212, A009445.
%K A122685 sign,easy,less
%O A122685 0,3
%A A122685 _Paul Curtz_, Jul 28 2007
%E A122685 Edited by _N. J. A. Sloane_, Jul 29 2007

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