A147263 - OEIS

A147263

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,1,9,9,33,33,105,105,825,825,13503,13503,390699,390699,

%T 9339771,9339771

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.

%e Maximal 9 X 9 example

%e .1.0.0.0.0.0.0.0.1

%e .1.1.1.0.0.0.1.1.1

%e .0.0.1.1.0.1.1.0.0

%e .0.0.1.0.0.0.1.0.0

%e .0.0.0.0.0.0.0.0.0

%e .0.0.1.0.0.0.1.0.0

%e .0.0.1.1.0.1.1.0.0

%e .1.1.1.0.0.0.1.1.1

%e .1.0.0.0.0.0.0.0.1

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008