%I #3 Nov 11 2014 20:16:20
%S 0,0,0,2,21,131,733,3882,19641,97282
%N Number of ways to place two non-attacking queens on all free n-ominoes.
%e The pentomino XXXX admits 2 combinations of 2 non-attacking queens.
%e ............. X
%K nonn
%O 1,4
%A _David Scambler_, Aug 27 2010