A147181 - OEIS

A147181

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0101 pattern in any orientation.

%I #4 Mar 31 2012 12:35:15

%S 1,1,1,1,1,5,17,37,129,675,4545,33673,284663,3050875,41150087,

%T 686710451,13852947253,339116701643,10235218350849,379099740909573

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0101 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.1.0.0.0

%e .0.0.0.0.1.1.1.1

%e .0.0.1.1.0.1.0.1

%e .0.0.0.1.1.0.0.0

%e .0.0.0.1.0.0.0.0

%e .0.0.0.1.1.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008