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 A331654 #5 Jan 25 2020 02:22:41
%S A331654 1,1,1,2,1,6,1,44,6,519,1,8363,1,163357,9427,3988615,1,117148318,1,
%T A331654 3986012464,84012192,157783127674,1,7143740399835,248686,
%U A331654 364166073164915,2479642897110,20827974319925302,1,1324585467847848929,1,92917902002561639120,190678639438170503
%N A331654 Number of binary matrices with a total of n ones, distinct columns each with the same number of ones and distinct nonzero rows in decreasing lexicographic order.
%C A331654 The condition that the rows be in decreasing order is equivalent to considering nonequivalent matrices with distinct rows up to permutation of rows.
%F A331654 a(n) = Sum_{d|n} A331039(n/d, d).
%e A331654 The a(6) = 6 matrices are:
%e A331654 [1 0 0 0 0 0] [1 1 1] [1 1 0] [1 1 0] [1 0 1] [1 1 0]
%e A331654 [0 1 0 0 0 0] [1 0 0] [1 0 1] [1 0 0] [1 0 0] [1 0 1]
%e A331654 [0 0 1 0 0 0] [0 1 0] [0 1 0] [0 1 1] [0 1 1] [0 1 1]
%e A331654 [0 0 0 1 0 0] [0 0 1] [0 0 1] [0 0 1] [0 1 0]
%e A331654 [0 0 0 0 1 0]
%e A331654 [0 0 0 0 0 1]
%Y A331654 Cf. A331039.
%K A331654 nonn
%O A331654 1,4
%A A331654 _Andrew Howroyd_, Jan 24 2020