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%I #6 Feb 07 2020 20:49:35
%S 1,0,0,3,23,191,2203,31313
%N Number of nonequivalent n-column binary matrices with 3 ones in every column and any number of distinct nonzero rows up to permutation of rows and columns.
%e The a(3) = 3 matrices are:
%e [1, 1, 0] [1, 1, 1] [1, 1, 1]
%e [1, 0, 1] [1, 1, 0] [1, 1, 0]
%e [1, 0, 0] [1, 0, 1] [1, 0, 1]
%e [0, 1, 1] [0, 1, 0] [0, 1, 1]
%e [0, 1, 0] [0, 0, 1]
%e [0, 0, 1]
%Y Row n=3 of A331510.
%Y Cf. A331717.
%K nonn,more
%O 0,4
%A _Andrew Howroyd_, Feb 02 2020
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