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 A384679 #16 Jun 14 2025 17:16:45 %S A384679 1,2,3,10,30,123,500,2240,10153,47341,223015,1063340,5108118,24710991, %T A384679 120202087,587570923,2884199700,14210246496,70242677688 %N A384679 Number of edge-connected components on the faces of a tetrakis square tiling where the degree-8 vertices have been truncated, up to translation, rotation and reflection of the tiling. %C A384679 There are two types of tiles: those that come from truncating the degree-8 vertices, and those that are a subset of the triangular tiles in the tetrakis square tiling. %H A384679 Sven Geier, <a href="https://mathstodon.xyz/@SvenGeier/114462923594235265">Driveway in Highland Park, CA</a>. %H A384679 Peter Kagey, <a href="/A384679/a384679.png">Illustration of a(4) = 30</a>. %Y A384679 Cf. A197465 (tetrakis square tiling). %K A384679 nonn,more %O A384679 0,2 %A A384679 _Peter Kagey_, Jun 06 2025 %E A384679 a(9)-a(18) from _Bert Dobbelaere_, Jun 14 2025