A146243 - OEIS

A146243

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-010 pattern in any orientation.

%I #4 Mar 31 2012 12:35:09

%S 1,1,3,5,11,29,171,783,4399,33371,348951,4490023,67743969,1262306965,

%T 30412318737,938946971693,36229300537639,1709400162886171,

%U 100764547585566691,7519118775918147695,708647258526428184031

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.0.0.0.0.1.0

%e .1.1.1.0.0.1.1.1

%e .0.1.1.0.0.0.1.1

%e .0.0.0.1.1.0.0.0

%e .0.0.0.1.1.1.0.0

%e .0.1.0.0.1.0.1.0

%e .1.1.1.0.0.1.1.1

%e .0.1.1.0.0.0.1.1

%K nonn

%O 1,3

%A _R. H. Hardin_