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 A331650 #8 Jan 25 2020 17:56:05 %S A331650 1,0,0,840,768785,1493786233,5254074934990,29830719723310370, %T A331650 255792964622656480490,3156204819384156606884415, %U A331650 53951801951854013864607338684,1238521839654509818636854497532129,37207357446549003419594083481144144755,1431264458992614322596852782769837314471920 %N A331650 Number of binary matrices with n distinct columns and any number of distinct nonzero rows with 4 ones in every column and columns in decreasing lexicographic order. %C A331650 The condition that the columns be in decreasing order is equivalent to considering nonequivalent matrices with distinct columns up to permutation of columns. %H A331650 Andrew Howroyd, <a href="/A331650/b331650.txt">Table of n, a(n) for n = 0..50</a> %Y A331650 Row n=4 of A331569. %K A331650 nonn %O A331650 0,4 %A A331650 _Andrew Howroyd_, Jan 24 2020