A146653 - OEIS

A146653

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0100-1111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:11

%S 1,1,1,1,3,7,19,43,173,1027,6241,39873,317065,3440337,46130903,

%T 694355761,12449375951,281232131103,7909400224367,265990951612641

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0100-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.1.1.1.0.0.0

%e .1.0.0.1.0.0.0.0

%e .1.0.0.1.1.0.0.0

%e .1.1.1.0.0.1.0.1

%e .1.0.1.0.0.1.1.1

%e .0.0.0.1.1.0.0.1

%e .0.0.0.0.1.0.0.1

%e .0.0.0.1.1.1.1.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008