A146043 - OEIS

A146043

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.

%I #3 Mar 31 2012 12:35:09

%S 1,1,1,1,1,1,1,1,1,1,5,5,21,21,83,83,385,385,2131,2131,24025,24025,

%T 318135,318135,5078109,5078109,98561015

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 2X4 tee 1,1 1,2 1,3 2,3 1,4 in any orientation.

%e Maximal 11 X 11 example

%e .0.0.0.0.1.0.1.0.0.0.0

%e .0.0.0.1.1.0.1.1.0.0.0

%e .0.0.1.0.1.0.1.0.1.0.0

%e .1.1.1.1.0.0.0.1.1.1.1

%e .0.0.0.0.0.0.0.0.0.0.0

%e .1.1.1.1.0.0.0.1.1.1.1

%e .0.0.1.0.1.0.1.0.1.0.0

%e .0.0.0.1.1.0.1.1.0.0.0

%e .0.0.0.0.1.0.1.0.0.0.0

%K nonn

%O 1,11

%A _R. H. Hardin_, Oct 26 2008