Number of 2 X 2 matrices with all terms in {0,1,...,n} and odd trace.

Terms

a(0) =0a(1) =8a(2) =36a(3) =128a(4) =300a(5) =648a(6) =1176a(7) =2048a(8) =3240a(9) =5000a(10) =7260a(11) =10368a(12) =14196a(13) =19208a(14) =25200a(15) =32768a(16) =41616a(17) =52488a(18) =64980a(19) =80000a(20) =97020a(21) =117128a(22) =139656a(23) =165888a(24) =195000a(25) =228488a(26) =265356a(27) =307328a(28) =353220a(29) =405000