Vandermonde determinant of the divisors of n.

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =4a(5) =120a(6) =6a(7) =1008a(8) =96a(9) =4320a(10) =10a(11) =68428800a(12) =12a(13) =32760a(14) =26880a(15) =20321280a(16) =16a(17) =53299814400a(18) =18a(19) =127650816000a(20) =241920a(21) =415800a(22) =22a(24) =1920a(25) =1029600a(26) =1078272a(28) =28a(30) =30a(32) =3379200a(33) =4308480