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 A360664 #8 Feb 15 2023 20:53:30 %S A360664 1,1,4,121,316622,170309112972,27417944542834007012, %T A360664 1999576637456562016308833727820, %U A360664 95614444589289128555388037722252407519896044,4112190260012069813083100063825969898935642267505877920574871 %N A360664 Number of inequivalent n X n matrices using exactly n different symbols, where equivalence means permutations of rows or columns or the symbol set. %H A360664 Alois P. Heinz, <a href="/A360664/b360664.txt">Table of n, a(n) for n = 0..14</a> %F A360664 a(n) = A242106(n,n). %e A360664 a(2) = 4: %e A360664 [1 0] [1 1] [1 0] [1 0] %e A360664 [0 0], [0 0], [1 0], [0 1]. %Y A360664 Main diagonal of A242106. %K A360664 nonn %O A360664 0,3 %A A360664 _Alois P. Heinz_, Feb 15 2023