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 A256569 #10 Apr 02 2015 17:33:10 %S A256569 1,6,21,61,171,461,1181,2951 %N A256569 a(n) is the total number of pentagrams in a variant of pentagram fractal after n iterations. %C A256569 Inspired by A255870. But at the higher iterations, the perimeter would be an irregular polygon instead of a pentagon. The construction rule is vertex to vertex expansion. See illustration in the links. %H A256569 Kival Ngaokrajang, <a href="/A256569/a256569.pdf">Illustration of initial terms</a> %Y A256569 Cf. A255870, A256429, A256571. %K A256569 nonn,more %O A256569 1,2 %A A256569 _Kival Ngaokrajang_, Apr 02 2015