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 A376823 #7 Oct 05 2024 16:30:41 %S A376823 0,9,2022,2679246,33887517990,4169289730628814,4883659745750360600262, %T A376823 53651309691205903304049168186,5474401089420129832016444491921748358, %U A376823 5153775207320113272335114827748860107542139918,44553974378043749018442678682265335735181851572329684070 %N A376823 Number of colorings of a toroidal n X n grid using exactly three colors under translational symmetry. %H A376823 Andrew Howroyd, <a href="/A376823/b376823.txt">Table of n, a(n) for n = 1..40</a> %F A376823 a(n) = A184278(n) - 3*A179043(n) + 3. %Y A376823 Main diagonal of A294685. %Y A376823 Cf. A179043, A184278, A376748 (colors permutable), A376822, A376824, A376825. %K A376823 nonn %O A376823 1,2 %A A376823 _Andrew Howroyd_, Oct 05 2024