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 A151539 #12 Feb 16 2025 08:33:09 %S A151539 1,3,19,104,719,5123,37936,286606,2202201,17119423,134401246, %T A151539 1063570767,8473332319 %N A151539 Number of 1-sided triangular polyedges with n cells. %H A151539 Ed Pegg, Jr., <a href="http://demonstrations.wolfram.com/PolyformExplorer/">Illustrations of polyforms</a> %H A151539 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Polyedge.html">Polyedge</a> %Y A151539 Cf. A151540, A151541, A159867. %K A151539 nonn,hard,more %O A151539 1,2 %A A151539 _Ed Pegg Jr_, May 13 2009 %E A151539 a(9) and a(10) from _Joseph Myers_, Oct 05 2011 %E A151539 a(11)-a(13) from _Aaron N. Siegel_, May 23 2022