Number of 4 X 4 matrices in Hermite normal form with determinant n.

Terms

a(0) =1a(1) =8a(2) =27a(3) =96a(4) =125a(5) =324a(6) =343a(7) =832a(8) =972a(9) =1500a(10) =1331a(11) =3384a(12) =2197a(13) =4116a(14) =4500a(15) =7744a(16) =4913a(17) =11178a(18) =6859a(19) =15000a(20) =12348a(21) =15972a(22) =12167a(23) =31896a(24) =18750a(25) =26364a(26) =26973a(27) =41160a(28) =24389a(29) =57150