Number of nonnegative integer 3 X 3 matrices with no zero rows or columns and with sum of elements equal to n, up to row and column permutation.

A054975

Number of nonnegative integer 3 X 3 matrices with no zero rows or columns and with sum of elements equal to n, up to row and column permutation.

Terms

    a(0) =1a(1) =3a(2) =13a(3) =38a(4) =97a(5) =217a(6) =453a(7) =868a(8) =1585a(9) =2756a(10) =4606a(11) =7440a(12) =11679a(13) =17849a(14) =26674a(15) =39060a(16) =56144a(17) =79387a(18) =110575a(19) =151904a(20) =206063a(21) =276332a(22) =366561a(23) =481484a(24) =626586a(25) =808431a(26) =1034636a(27) =1314242a(28) =1657500a(29) =2076601

External references