Determinant of the n X n matrix M_(i,j)=i/gcd(i,j)=lcm(i,j)/j.

Terms

a(0) =1a(1) =-1a(2) =2a(3) =-2a(4) =8a(5) =16a(6) =-96a(7) =96a(8) =-192a(9) =-768a(10) =7680a(11) =15360a(12) =-184320a(13) =-1105920a(14) =-8847360a(15) =8847360a(16) =-141557760a(17) =-283115520a(18) =5096079360a(19) =20384317440a(20) =244611809280