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%I #4 Feb 01 2020 14:38:17
%S 1,3,23,162,1338,10585,82694,612700,4337251,29267424,189156449,
%T 1174258396,7027652401,40665520091,228144483468,1243885610116,
%U 6604645458105,34214740832064,173212883196153,858180731755508,4166502761618085,19845587224548144,92834956645809855,426901317803272329
%N 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.
%Y Column k=3 of A331485.
%K nonn
%O 0,2
%A _Andrew Howroyd_, Jan 31 2020
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