A147370 - OEIS

A147370

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0111-1100-0111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:16

%S 1,1,1,1,1,1,1,1,14,9,82,25,666,57,4092,377,52105,5329,1098160,73458,

%T 31100564,886631,940187683,17314150,39465005389,625360491

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0111-1100-0111 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.1.0.1.0.0.0

%e .0.0.0.1.1.1.0.0.0

%e .1.1.1.0.1.0.1.1.1

%e .0.0.1.1.0.1.1.0.0

%e .1.1.1.0.1.0.1.1.1

%e .0.0.0.1.1.1.0.0.0

%e .0.0.0.1.0.1.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_