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 A304556 #9 Feb 16 2025 08:33:54 %S A304556 0,4,54,928,31338,2060618,266749364,68574754440,35160711883758 %N A304556 Number of total dominating sets in the n-triangular honeycomb queen graph. %H A304556 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TotalDominatingSet.html">Total Dominating Set</a> %Y A304556 Cf. A289876, A304560, A304566. %K A304556 nonn,more %O A304556 1,2 %A A304556 _Eric W. Weisstein_, May 14 2018 %E A304556 a(8)-a(9) from _Andrew Howroyd_, May 19 2018