A146998 - OEIS

A146998

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-00100-11111 pattern in any orientation.

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

%S 1,1,1,1,1,3,8,23,61,183,609,3021,17551,122559,936997,8112490,

%T 77983308,921842339,13073413646,221502161483,4341535999765,

%U 98829117614873,2578684019463460,79032276911025441

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 00100-00100-11111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.1.1.1.1.0.0

%e .1.0.0.1.0.0.0.0

%e .1.0.0.1.0.0.0.1

%e .1.1.1.0.0.0.0.1

%e .1.0.0.0.0.1.1.1

%e .1.0.0.0.1.0.0.1

%e .0.0.0.0.1.0.0.1

%e .0.0.1.1.1.1.1.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008