A146259 - OEIS

A146259

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-101 pattern in any orientation.

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

%S 1,1,1,1,3,13,31,77,447,3609,25623,200309,2271887,36004709,643384137,

%T 13404301669,367224822485,12922817223889,545705442791831,

%U 28082761867376669,1838300090661189305

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-101 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.1.1.0.0.0

%e .0.0.1.1.0.0.0.0

%e .1.1.0.1.1.0.0.0

%e .1.1.1.0.0.1.0.1

%e .1.0.1.0.0.1.1.1

%e .0.0.0.1.1.0.1.1

%e .0.0.0.0.1.1.0.0

%e .0.0.0.1.1.1.0.0

%K nonn

%O 1,5

%A _R. H. Hardin_