The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #2 Apr 30 2014 01:33:20
%S 0,1,12,320,16128,1382400,186802176,37571788800,10752302776320,
%T 4222605695385600,2209155036594831360,1502185604799843532800,
%U 1300250162749167894528000,1407357631537525272084480000
%N Multiple of coefficients in expansion of 1/sin(x)^2.
%o (PARI) a(n)=if(n<1,0,(n+1)!*(2*n+1)!/4*polcoeff(1/sin(x+O(x^(2*n+2)))^2,2*n-2))
%K nonn,easy
%O 0,3
%A _Michael Somos_, Feb 14 2003