A146923 - OEIS

A146923

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-1111-0110 pattern in any orientation.

%I #4 Mar 31 2012 12:35:14

%S 1,1,1,1,1,1,1,6,12,19,29,56,159,456,1350,3940,11848,42451,167584,

%T 713562,3187201

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-1111-0110 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.0.0.0

%e .0.0.1.1.1.1.0.0

%e .0.1.0.1.1.0.1.0

%e .1.1.1.0.0.1.1.1

%e .0.1.0.1.1.0.1.0

%e .0.0.1.1.1.1.0.0

%e .0.0.0.1.1.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008