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 A124006 #33 Feb 12 2022 18:07:34 %S A124006 1,4,12,52,228,1192,6160,33344,191380,1072232,6416600,35990544, %T A124006 212278256,1145811772 %N A124006 Number of Othello positions with unique realization at the end of the n-th ply. %H A124006 Alain Brobecker, <a href="http://abrobecker.free.fr/text/othello.pdf">Othello and retrograde analysis (pdf)</a> %H A124006 Alain Brobecker, <a href="http://abrobecker.free.fr/tools/othello.zip">programs to generate sequences</a> %H A124006 Alain Brobecker, <a href="http://abrobecker.free.fr/tools/othello.c">othello.c</a> %Y A124006 Cf. A124004, A124005. %K A124006 fini,hard,more,nonn %O A124006 0,2 %A A124006 _Alain Brobecker_, Nov 01 2006 %E A124006 a(8)-a(9) from _Alain Brobecker_, Dec 30 2006 %E A124006 Edited by _Charles R Greathouse IV_, Oct 28 2009 %E A124006 a(10)-a(12) from _Dominic Hofer_, Sep 27 2019 %E A124006 a(13) from _Dominic Hofer_, Feb 11 2022