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

Terms

a(0) =0a(1) =4a(2) =92a(3) =156a(4) =284a(5) =412a(6) =604a(7) =796a(8) =1052a(9) =1244a(10) =1628a(11) =1948a(12) =2204a(13) =2588a(14) =3164a(15) =3420a(16) =3932a(17) =4444a(18) =5020a(19) =5596a(20) =6108a(21) =6492a(22) =7452a(23) =8156a(24) =8668a(25) =9308a(26) =10460a(27) =11036a(28) =11804a(29) =12700