Number of nonnegative integer 3 X 3 matrices with sum of elements equal to n, under row and column permutations.

A052365

Number of nonnegative integer 3 X 3 matrices with sum of elements equal to n, under row and column permutations.

Terms

    a(0) =1a(1) =1a(2) =4a(3) =10a(4) =24a(5) =51a(6) =114a(7) =219a(8) =424a(9) =768a(10) =1352a(11) =2278a(12) =3759a(13) =5978a(14) =9328a(15) =14181a(16) =21164a(17) =30943a(18) =44560a(19) =63063a(20) =88088a(21) =121321a(22) =165152a(23) =222157a(24) =295857a(25) =389948a(26) =509456a(27) =659697a(28) =847552a(29) =1080452

External references