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 A125529 #20 Feb 12 2022 18:07:12 %S A125529 1,4,12,52,196,932,3944,14020,53556,165584,507656,1251972,2988984, %T A125529 5904880 %N A125529 Number of Othello shapes with unique realization at the end of the n-th ply. %H A125529 Alain Brobecker, <a href="http://abrobecker.free.fr/text/othello.pdf">Othello and retrograde analysis (pdf)</a> %H A125529 Alain Brobecker, <a href="http://abrobecker.free.fr/tools/othello.zip">programs to generate sequences</a> %Y A125529 Cf. A124004, A124005, A124006. %K A125529 fini,hard,nonn %O A125529 0,2 %A A125529 _Alain Brobecker_, Dec 30 2006 %E A125529 Edited by _Charles R Greathouse IV_, Oct 28 2009 %E A125529 a(10)-a(12) from _Dominic Hofer_, Mar 04 2020 %E A125529 a(13) from _Dominic Hofer_, Feb 11 2022