A147101 - OEIS

A147101

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:15

%S 1,1,1,1,1,1,1,1,5,5,19,19,87,87,379,379,2665,2665,39873,39873,702997,

%T 702997,16924511,16924511,488669357,488669357

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.1.0.1.0.0.0

%e .0.0.1.1.0.1.1.0.0

%e .1.1.1.0.0.0.1.1.1

%e .0.0.0.0.0.0.0.0.0

%e .1.1.1.0.0.0.1.1.1

%e .0.0.1.1.0.1.1.0.0

%e .0.0.0.1.0.1.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008