640869140625domain: NAppears in sequencesa(n) = det(M(n)) where M(n) is the n X n matrix defined by m(i,i)=6, m(i,j)=i/j.at n=15A0790275th binomial transform of (1,1,0,0,0,0,.....).at n=16A081105Hypotenuses for which there exist exactly 15 distinct integer triangles.at n=14A290503