A146874 - OEIS

A146874

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1110-0100-0111 pattern in any orientation.

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

%S 1,1,1,1,1,5,17,37,81,581,4553,28101,163497,1904517,29561545,

%T 451624245,6956479641,156904159893,4856658148681,169058959345685,

%U 6417340281818617

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1110-0100-0111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.0.1.1.1

%e .0.0.0.0.0.0.1.0

%e .0.0.0.0.1.1.1.0

%e .0.0.0.1.0.0.0.0

%e .0.1.0.1.0.0.0.0

%e .0.1.1.1.0.0.0.0

%e .0.1.0.0.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008