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%I #8 Oct 18 2023 11:49:40
%S 1,2,7,21,66,192,565,1579,4348,11582,30205,76736,191120,465920,
%T 1115572,2623885,6074353,13849021,31137381,69082779,151390617,
%U 327897173,702426987,1489108503,3125821257,6500086120,13396645887,27376083598,55490121271,111604327066,222798559100
%N Number of nonequivalent 2-column nonnegative integer matrices with column sums n and any number of nonzero rows up to permutation of rows and columns.
%H Zarif Ahsan, Xiran Liu, and Noah Rosenberg, <a href="https://surim.stanford.edu/publications/combinatorics/dissimilarity-between-pair-draws-discrete-probability-vectors-finite">Dissimilarity between a pair of draws from discrete probability vectors on finite sets of objects</a>, Stanford Univ., 2023.
%Y Column k=2 of A331485.
%K nonn
%O 0,2
%A _Andrew Howroyd_, Jan 31 2020
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