A146786 - OEIS

A146786

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

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

%S 1,1,1,1,3,9,27,85,337,1791,13253,115267,1169733,14374957,216583105,

%T 4102635811,98419728413,2904752917775,103834255604223,4525458320487677

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

%e Maximal 8 X 8 example

%e .0.0.0.1.1.0.0.0

%e .0.0.1.1.1.0.0.0

%e .0.1.0.0.1.0.0.0

%e .1.1.0.0.1.0.1.1

%e .1.1.1.1.0.1.1.1

%e .0.0.0.0.1.0.0.1

%e .0.0.0.1.1.0.0.1

%e .0.0.0.1.1.1.1.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008