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 A335656 #13 Jun 16 2020 17:46:43 %S A335656 1,4,12,60,296,1338,5648,21842,77559,249690,717788,1834379,4138302, %T A335656 8171208,14020166,20773236,26482824,28994876,27286330,22106348, %U A335656 15425572,9274496,4792664,2120101,800152,255544,68236,14727,2529,334,32,5 %N A335656 Number of distinct board states reachable in n jumps, in English Peg Solitaire. %H A335656 Robin Houston, <a href="https://github.com/robinhouston/solitaire">Code used to generate this sequence</a> %e A335656 Example: for n=1 the four states are: %e A335656 *** *** *** *** %e A335656 *.* *** *** *** %e A335656 ***.*** ******* ******* ******* %e A335656 ******* ****..* ******* *..**** %e A335656 ******* ******* ***.*** ******* %e A335656 *** *** *.* *** %e A335656 *** *** *** *** %Y A335656 Identifying positions that are related by a symmetry of the board gives A112737. %K A335656 fini,full,nonn %O A335656 0,2 %A A335656 _Robin Houston_, Jun 16 2020