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 A376824 #8 Oct 05 2024 16:30:38 %S A376824 0,6,20720,257706024,44900438149488,131160169581733489616, %T A376824 6467585568566200114362823920,5316911768534424725926923896066891424, %U A376824 72172920340122292837562997014593985220649867760,16069380442569287654590340470284256047904187412954757496784 %N A376824 Number of colorings of a toroidal n X n grid using exactly four colors under translational symmetry. %H A376824 Andrew Howroyd, <a href="/A376824/b376824.txt">Table of n, a(n) for n = 1..40</a> %F A376824 a(n) = A184272(n) - 4*A184278(n) + 6*A179043(n) - 4. %Y A376824 Main diagonal of A294686. %Y A376824 Cf. A179043, A184272, A184278, A376749 (colors permutable), A376822, A376823, A376825. %K A376824 nonn %O A376824 1,2 %A A376824 _Andrew Howroyd_, Oct 05 2024