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

0,2

Links

Table of n, a(n) for n=0..23.

Crossrefs

Column k=3 of A331485.

Sequence in context: A037789 A037670 A037796 * A212395 A027141 A002398

Adjacent sequences: A331720 A331721 A331722 * A331724 A331725 A331726

Keyword

nonn

Author

Andrew Howroyd, Jan 31 2020

Status

approved