A147374 - OEIS

A147374

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0111-1100-0111 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,5,20,29,50,83,280,625,2242,6281,30765,93559,481174,

%T 1596542,9219820,37372099,265178423,1263828408,10782899831

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0111-1100-0111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.0.0.1.1.1.0

%e .1.1.1.0.0.0.1.1

%e .1.0.1.0.1.1.1.0

%e .1.0.1.0.0.0.0.0

%e .0.0.0.0.0.1.0.1

%e .0.1.1.1.0.1.0.1

%e .1.1.0.0.0.1.1.1

%e .0.1.1.1.0.0.1.0

%K nonn

%O 1,8

%A _R. H. Hardin_