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Number of ways to place two non-attacking wazirs on all free n-ominoes.
0

%I #6 Apr 29 2016 20:10:03

%S 0,0,2,14,71,341,1591,7610,35432,165209

%N Number of ways to place two non-attacking wazirs on all free n-ominoes.

%e E.g. the triomino XXX admits 1 combination of 2 non-attacking wazirs.

%e The triomino XX admits 1 combination of 2 non-attacking wazirs.

%e ............ X

%K nonn

%O 1,3

%A _David Scambler_, Aug 27 2010