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