Number of 3 X 3 matrices with unit determinant and positive integer entries whose sum is n.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =0a(11) =9a(12) =18a(13) =72a(14) =108a(15) =234a(16) =360a(17) =747a(18) =756a(19) =1818a(20) =1782a(21) =3222a(22) =3672a(23) =6615a(24) =5850a(25) =11394a(26) =11034a(27) =16623a(28) =17028a(29) =30204