A146596 - OEIS

A146596

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1000-1111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:11

%S 1,1,1,1,1,1,1,1,17,17,77,77,549,549,6061,6061,126381,126381,3867721,

%T 3867721,164716773,164716773

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1000-1111 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.0.0.0.0

%e .1.0.0.0.0.0.0.0.1

%e .1.1.1.1.0.1.1.1.1

%e .0.0.0.0.0.0.0.0.0

%e .1.1.1.1.0.1.1.1.1

%e .1.0.0.0.0.0.0.0.1

%e .0.0.0.0.0.0.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008