10668672000domain: NAppears in sequencesLet M_n be the n X n matrix with M_n(i,j)=1/(i+j+1); then a(n)=1/det(M_n).at n=3A069640a(n) = n*Product_{k=1..n} floor(k^((n-k)/(n-k+1))).at n=15A333690