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 A047942 #9 Apr 14 2021 22:28:12 %S A047942 1,7,616,10092775,8308234084801,335267154940213889575, %T A047942 662932711464913775048175499816, %U A047942 64230894380264719522488136461023341060807,304940121908958925034643465916849873749900601574419201,70938377295002676956115265690779190293441720530070400876280330568007 %N A047942 Number of 7-colorings of an n X n grid, up to rotational symmetry. %H A047942 Andrew Howroyd, <a href="/A047942/b047942.txt">Table of n, a(n) for n = 0..25</a> %F A047942 a(n) = (m^(n^2) + 2 m^((n^2 + 3 (n mod 2))/4) + m^((n^2 + (n mod 2))/2))/4, with m = 7. %Y A047942 Column k=7 of A343095. %Y A047942 Cf. A047937. %K A047942 nonn %O A047942 0,2 %A A047942 _Rob Pratt_ %E A047942 Terms a(8) and beyond from _Andrew Howroyd_, Apr 14 2021