Number of 2 X 2 matrices having entries in {0,1,...,n} and determinant in the open interval (-n,n) with no entry repeated.

A279273

Number of 2 X 2 matrices having entries in {0,1,...,n} and determinant in the open interval (-n,n) with no entry repeated.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =8a(4) =40a(5) =104a(6) =216a(7) =440a(8) =720a(9) =1160a(10) =1656a(11) =2432a(12) =3216a(13) =4472a(14) =5680a(15) =7280a(16) =9128a(17) =11328a(18) =13504a(19) =16632a(20) =19424a(21) =23216a(22) =27088a(23) =31600a(24) =35832a(25) =41912a(26) =47192a(27) =53544a(28) =60152a(29) =68192

External references