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 A071307 #7 Nov 08 2022 11:07:48 %S A071307 1,12,648,419904,3061100160 %N A071307 1/2 number of n X n 0..8 matrices with MM' mod 9 = I. %F A071307 Conjecture: a(n) = 3^(n*(n-1)/2) * A071302(n) for n >= 1. - _Michel Marcus_, Nov 08 2022 %Y A071307 Cf. A071302. %K A071307 nonn,more %O A071307 1,2 %A A071307 _R. H. Hardin_, Jun 11 2002