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 A333900 #8 Apr 20 2020 17:55:46 %S A333900 1,0,0,0,1,1,130,16700,3330915,957659906,382304435016,204772106834160, %T A333900 143299238797934175,128179127293763395905,143868740984351881041401, %U A333900 199438057945979365292917046,336793287548313747690192184440,684521312346990661869780271166300 %N A333900 Number of nonequivalent n X n binary matrices with 4 ones in every row and column up to permutation of rows. %C A333900 Number of factorizations of m^4 into n factors, where m is a product of exactly n distinct primes and each factor is a product of 4 distinct primes. %H A333900 Andrew Howroyd, <a href="/A333900/b333900.txt">Table of n, a(n) for n = 0..50</a> %Y A333900 Column k=4 of A260340. %Y A333900 Cf. A268668. %K A333900 nonn %O A333900 0,7 %A A333900 _Andrew Howroyd_, Apr 18 2020