Number of 2 X 2 matrices having all terms in {-n,...,0,...,n} and determinant n.

Terms

a(0) =1a(1) =20a(2) =92a(3) =176a(4) =364a(5) =408a(6) =880a(7) =704a(8) =1420a(9) =1412a(10) =2088a(11) =1552a(12) =3760a(13) =2104a(14) =3808a(15) =4096a(16) =5388a(17) =3400a(18) =7660a(19) =4208a(20) =9160a(21) =7392a(22) =8464a(23) =5952a(24) =15344a(25) =8428a(26) =11656a(27) =11584a(28) =16608a(29) =9208