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

Terms

a(0) =24a(1) =196a(2) =784a(3) =2304a(4) =5324a(5) =10964a(6) =19756a(7) =33772a(8) =53496a(9) =81396a(10) =118452a(11) =168324a(12) =229964a(13) =310132a(14) =407964a(15) =527644a(16) =670888a(17) =844896a(18) =1045916a(19) =1286220a(20) =1560508a(21) =1879548a(22) =2244404a(23) =2664180a(24) =3130076a(25) =3663856a(26) =4260240a(27) =4927920a(28) =5665992