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%I #5 Mar 30 2012 18:39:23
%S 1,1,-1,-1,0,1,-5,-4,-3,13,16,-5,1,-1,-8,-48,32,39,99,78,-307,333,603,
%T -35,-1068,936,-444,-1619,-595,5104,10604,14864,-35275,-78279,803467,
%U -126148,-2444027,-3581861,5584811,-2343023,-8951803,-8296504,16962643,27724933,53665144,-86430004,-463924640
%N a(n)=det(M_n) where M_n is the n X n matrix m(i,j)=1 if sigma(i+j) is odd, 0 otherwise.
%o (PARI) for(n=1,70,print1(matdet(matrix(n,n,i,j,if((-1)^(sigma(i+j))+1,0,1))),","))
%K easy,sign
%O 1,7
%A _Benoit Cloitre_, May 30 2002
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