login
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1110-0111 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:10

%S 1,1,1,1,3,9,23,85,375,2149,15299,129877,1353943,17475557,279267939,

%T 5511590965,133957241929,4003924495735,147542199515841,

%U 6704016396279819,375798793326385295,25965634034447375655

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

%e Maximal 8 X 8 example

%e .0.1.1.1.0.0.0.0

%e .1.0.1.1.1.0.0.0

%e .1.1.0.0.0.0.0.0

%e .1.1.0.0.0.0.1.0

%e .0.1.0.0.0.0.1.1

%e .0.0.0.0.0.0.1.1

%e .0.0.0.1.1.1.0.1

%e .0.0.0.0.1.1.1.0

%K nonn

%O 1,5

%A _R. H. Hardin_