%I #5 Feb 01 2020 13:39:43
%S 1,5,66,1338,43686,2142277,149056260,13991691663,1705750869937,
%T 262268740077763,49694977078927305,11388565848749818055,
%U 3107918736854019004136,996840601151518793573156,371595543159269706775806375,159437222426663041455988930042,78072200940916732097886063687252
%N Number of nonequivalent n-column nonnegative integer matrices with column sums 4 and any number of nonzero rows up to permutation of rows and columns.
%Y Row n=4 of A331485.
%K nonn
%O 0,2
%A _Andrew Howroyd_, Jan 31 2020