A146858 - OEIS

A146858

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111-0100 pattern in any orientation.

%I #4 Mar 31 2012 12:35:14

%S 1,1,1,1,1,5,17,43,153,711,4787,36997,323223,3456487,47029493,

%T 778875019,15666901145,390119856899,11978383979491,447614381910255,

%U 20341843546977767

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1101-0111-0100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.0.1.1.0.0

%e .0.0.1.1.1.0.0.0

%e .1.1.0.0.1.0.0.1

%e .0.1.0.0.0.1.1.1

%e .1.1.1.0.0.0.1.0

%e .1.0.0.1.0.0.1.1

%e .0.0.0.1.1.1.0.0

%e .0.0.1.1.0.1.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008