Number of 2 X 2 regular integer matrices with elements from {0,...,n} up to row and column permutation.

A064363

Number of 2 X 2 regular integer matrices with elements from {0,...,n} up to row and column permutation.

Terms

    a(0) =0a(1) =2a(2) =14a(3) =51a(4) =133a(5) =289a(6) =547a(7) =954a(8) =1546a(9) =2380a(10) =3508a(11) =5005a(12) =6915a(13) =9347a(14) =12353a(15) =16028a(16) =20468a(17) =25790a(18) =32054a(19) =39427a(20) =47965a(21) =57833a(22) =69155a(23) =82082a(24) =96682a(25) =113192a(26) =131720a(27) =152429a(28) =175467a(29) =201075

External references