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 A211179 #24 Apr 26 2023 07:09:33 %S A211179 1,1,5,31,238,2020,17754,160820,1479536,13792972,129839465 %N A211179 Number of free polypentagrams with n cells. %C A211179 A polypentagram is a plane figure made of five-pointed stars joined edge to edge. Free means that mirror images are counted as the same polypentagram. %H A211179 George Sicherman, <a href="https://sicherman.net/polypgrams/index.html">Catalogue of Polypentagrams</a> %e A211179 Five different figures can be formed by joining 3 pentagrams, so a(3) = 5. %Y A211179 Cf. A103465, A000105, A000507. %K A211179 nonn,hard,more %O A211179 1,3 %A A211179 _George Sicherman_, Feb 01 2013 %E A211179 a(6)-a(11) from _Aaron N. Siegel_, May 23 2022