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 A125528 #19 Feb 12 2022 18:07:22 %S A125528 1,4,12,54,220,1130,5568,26966,132037,589652,2601811,10147378, %T A125528 38356054,129698048 %N A125528 Number of different Othello shapes at the end of the n-th ply. %H A125528 Alain Brobecker, <a href="http://abrobecker.free.fr/text/othello.pdf">Othello and retrograde analysis (pdf)</a> %H A125528 Alain Brobecker, <a href="http://abrobecker.free.fr/tools/othello.zip">programs to generate sequences</a> %Y A125528 Cf. A124004, A124005, A124006. %K A125528 fini,hard,nonn %O A125528 0,2 %A A125528 _Alain Brobecker_, Dec 30 2006 %E A125528 Edited by _Charles R Greathouse IV_, Oct 28 2009 %E A125528 a(10)-a(12) from _Dominic Hofer_, Mar 04 2020 %E A125528 a(13) from _Dominic Hofer_, Feb 11 2022