Number of 2 X 2 matrices having all terms in {-n,...,0,...,n} and determinant n-1.

Terms

a(0) =0a(1) =33a(2) =52a(3) =156a(4) =240a(5) =492a(6) =472a(7) =1072a(8) =832a(9) =1612a(10) =1540a(11) =2408a(12) =1680a(13) =4144a(14) =2296a(15) =4064a(16) =4352a(17) =5900a(18) =3592a(19) =8236a(20) =4464a(21) =9544a(22) =7712a(23) =9168a(24) =6208a(25) =15984a(26) =8812a(27) =12232a(28) =11968a(29) =17504