Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant in the closed interval [-n,n].

A211031

Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant in the closed interval [-n,n].

Terms

    a(0) =1a(1) =16a(2) =69a(3) =176a(4) =375a(5) =650a(6) =1107a(7) =1626a(8) =2413a(9) =3326a(10) =4527a(11) =5782a(12) =7689a(13) =9436a(14) =11753a(15) =14354a(16) =17491a(17) =20458a(18) =24623a(19) =28334a(20) =33425a(21) =38438a(22) =44031a(23) =49450a(24) =57323a(25) =64028a(26) =71849a(27) =80078a(28) =89857a(29) =98468

External references