%I #6 Apr 29 2016 20:09:08
%S 0,0,1,7,46,240,1207,6004,28903,137996
%N Number of ways to place two non-attacking kings on all free n-ominoes.
%e E.g. the triomino XXX admits 1 combination of 2 non-attacking kings.
%K nonn
%O 1,4
%A _David Scambler_, Aug 27 2010