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

Terms

a(0) =0a(1) =6a(2) =16a(3) =96a(4) =168a(5) =486a(6) =720a(7) =1536a(8) =2080a(9) =3750a(10) =4800a(11) =7776a(12) =9576a(13) =14406a(14) =17248a(15) =24576a(16) =28800a(17) =39366a(18) =45360a(19) =60000a(20) =68200a(21) =87846a(22) =98736a(23) =124416a(24) =138528a(25) =171366a(26) =189280a(27) =230496a(28) =252840a(29) =303750