This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A330158 #70 Jan 13 2020 15:20:27
%S A330158 1,3,4,13,8,83,16,530,630,5620,57,119889,102,1901749,1498322,50091143,
%T A330158 298,1649302673,491,54919254373,16723808377,2269075359300,1256,
%U A330158 110133775311277,26852941986,5707320920415984,622570195638208,339574840900645411,4566,22572315004012650868
%N A330158 Number of nonnegative integer matrices with total sum n, distinct columns with equal sums and any number of nonzero rows in nonincreasing lexicographic order.
%C A330158 The condition that the rows be in nonincreasing order is equivalent to considering nonequivalent matrices up to permutation of rows.
%F A330158 a(n) = Sum_{d|n} A331161(n/d, d).
%e A330158 The a(4) = 13 matrices are:
%e A330158 [1 0 0 0] [1 0] [1] [1 1] [2 0] [1 0] [2]
%e A330158 [0 1 0 0] [1 0] [1] [1 0] [0 1] [1 0] [1]
%e A330158 [0 0 1 0] [0 1] [1] [0 1] [0 1] [0 2] [1]
%e A330158 [0 0 0 1] [0 1] [1]
%e A330158 .
%e A330158 [2 1] [2 0] [1 2] [3] [2] [4]
%e A330158 [0 1] [0 2] [1 0] [1] [2]
%Y A330158 Cf. A331161.
%K A330158 nonn
%O A330158 1,2
%A A330158 _Andrew Howroyd_, Jan 11 2020