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 A331717 #5 Feb 07 2020 20:49:28 %S A331717 1,0,1,4,12,36,124,412,1500 %N A331717 Number of nonequivalent n-column binary matrices with 2 ones in every column and any number of distinct nonzero rows up to permutation of rows and columns. %e A331717 The a(3) = 4 matrices are: %e A331717 [1 1 1] [1 1 0] [1 1 1] [1 1 0] %e A331717 [1 0 0] [1 0 1] [1 1 0] [1 0 1] %e A331717 [0 1 0] [0 1 0] [0 0 1] [0 1 1] %e A331717 [0 0 1] [0 0 1] %Y A331717 Row n=2 of A331510. %Y A331717 Cf. A331718. %K A331717 nonn,more %O A331717 0,4 %A A331717 _Andrew Howroyd_, Feb 02 2020