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 A371536 #38 Apr 05 2024 00:42:53 %S A371536 1,1,6,41,186 %N A371536 a(n) is the number of unobscured pentagons remaining after completing step n. %C A371536 Start with a single regular pentagon. The pentagon fractal is constructed by taking with the previous completed step, and overlapping it in its entirety to each vertex (excluding the top vertex as they overlap completely). Once constructed, any unobscured pentagons within are counted. "Unobscured" means no lines cross through it, and its shape is regular. See links for images. %H A371536 Gavin Lupo, <a href="/A371536/a371536_2.png">Pentagon Construction, the initial steps</a> %H A371536 Gavin Lupo, <a href="/A371536/a371536_3.png">Step 5</a> %e A371536 Start with a(1) = 1 unobscured pentagon. For the next step, take step 1's entire shape and place it at each vertex. Although the total number of pentagons is 5, only 1 unobscured pentagon remains, so a(2) = 1. %K A371536 nonn,more %O A371536 1,3 %A A371536 _Gavin Lupo_, Mar 26 2024