A331723 Number of nonequivalent 3-column nonnegative integer matrices with column sums n and any number of nonzero rows up to permutation of rows and columns.

1, 3, 23, 162, 1338, 10585, 82694, 612700, 4337251, 29267424, 189156449, 1174258396, 7027652401, 40665520091, 228144483468, 1243885610116, 6604645458105, 34214740832064, 173212883196153, 858180731755508, 4166502761618085, 19845587224548144, 92834956645809855, 426901317803272329

Offset: 0

Author

Andrew Howroyd, Jan 31 2020

Keywords

• nonn

Crossrefs

Column k=3 of A331485.