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

A211156

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

Terms

    a(0) =37a(1) =293a(2) =817a(3) =2513a(4) =4677a(5) =10149a(6) =15873a(7) =28545a(8) =40581a(9) =65093a(10) =86769a(11) =128977a(12) =164581a(13) =231173a(14) =285953a(15) =385153a(16) =464357a(17) =605477a(18) =715889a(19) =909201a(20) =1058501a(21) =1315237a(22) =1510721a(23) =1844289a(24) =2095429

External references