A147000 - OEIS

A147000

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 00100-00100-11111 pattern in any orientation.

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

%S 1,1,1,1,1,1,2,1,3,1,5,1,11,3,31,8,90,23,344,61,1429,183,6788,609,

%T 37364,3021,252513

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 00100-00100-11111 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.0.0.0.0.0.0

%e .0.0.1.1.1.1.1.0.0

%e .0.1.0.0.1.0.0.1.0

%e .0.1.1.1.0.1.1.1.0

%e .0.1.0.0.1.0.0.1.0

%e .0.0.1.1.1.1.1.0.0

%e .0.0.0.0.0.0.0.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008