Number of 2 X 2 matrices with entries in {0,1,...,n} and odd trace with no elements repeated.

Terms

a(0) =0a(1) =0a(2) =0a(3) =16a(4) =72a(5) =216a(6) =480a(7) =960a(8) =1680a(9) =2800a(10) =4320a(11) =6480a(12) =9240a(13) =12936a(14) =17472a(15) =23296a(16) =30240a(17) =38880a(18) =48960a(19) =61200a(20) =75240a(21) =91960a(22) =110880a(23) =133056a(24) =157872a(25) =186576a(26) =218400a(27) =254800a(28) =294840a(29) =340200