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 A047944 #9 Apr 14 2021 22:28:32 %S A047944 1,9,1665,96870249,463255057977921,179474496923598616041129, %T A047944 5632099886234793640483695986653185, %U A047944 14316042242555870306568544190208626253583093449,2947546144434645792880218215353988087374626027116634833972481 %N A047944 Number of 9-colorings of an n X n grid, up to rotational symmetry. %H A047944 Andrew Howroyd, <a href="/A047944/b047944.txt">Table of n, a(n) for n = 0..25</a> %F A047944 a(n) = (m^(n^2) + 2 m^((n^2 + 3 (n mod 2))/4) + m^((n^2 + (n mod 2))/2))/4, with m = 9. %Y A047944 Column k=9 of A343095. %Y A047944 Cf. A047937. %K A047944 nonn %O A047944 0,2 %A A047944 _Rob Pratt_ %E A047944 Terms a(8) and beyond from _Andrew Howroyd_, Apr 14 2021