%I #5 Mar 30 2012 18:38:57
%S 5,1260,8890560,1408264704000,4485780768268800000,
%T 269685408935166352128000000,294004853789028834558485643264000000,
%U 5657409727323500620299434201290024943616000000
%N Let M_n be the n X n matrix with M_n(i,j)=1/(i+j+3); then a(n)=1/det(M_n).
%o (PARI) for(n=1,10,print1(1/matdet(matrix(n,n,i,j,1/(i+j+3))),","))
%K easy,nonn
%O 1,1
%A _Benoit Cloitre_, Apr 21 2002