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%I #10 Apr 22 2015 18:27:01
%S 1,4,9,48,200,1440,8820,80640,653184,7257600,73180800,958003200,
%T 11564467200,174356582400,2451889440000,41845579776000,
%U 671854030848000,12804747411456000,231125690776780800,4865804016353280000
%N n*n!/round(n/2).
%F a(2n-1) = A052145(n).
%F a(2n) = 4*A002674(n) = 2*A010050(n) = 2^(n+1)*A000680(n), n>=1.
%o (PARI) a(n)=n*n!/round(n/2) \\ _M. F. Hasler_, Apr 22 2015
%Y Cf. A000142, A052145.
%K nonn,easy
%O 1,2
%A _M. F. Hasler_, Apr 21 2015
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