Number of 3 X 3 matrices with nonnegative integer entries and all row sums equal to n, up to row and column permutation.

A058389

Number of 3 X 3 matrices with nonnegative integer entries and all row sums equal to n, up to row and column permutation.

Terms

    a(0) =1a(1) =3a(2) =14a(3) =44a(4) =129a(5) =316a(6) =714a(7) =1452a(8) =2775a(9) =4963a(10) =8478a(11) =13838a(12) =21827a(13) =33306a(14) =49504a(15) =71754a(16) =101871a(17) =141807a(18) =194128a(19) =261570a(20) =347633a(21) =456026a(22) =591384a(23) =758596a(24) =963657a(25) =1212861a(26) =1513806a(27) =1874440a(28) =2304225a(29) =2813030

External references