A146275 - OEIS

A146275

Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-111 pattern in any orientation.

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

%S 1,1,3,5,9,21,93,381,1551,7459,56347,473995,4321181,46467441,

%T 656149111,10982021937,211884167843,4855692779387,137589956676037,

%U 4668303218338689,186691871576131219,8904751201199219747,514295038831216408667

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.1.0.0.1.1.1

%e .1.1.1.0.0.1.1.1

%e .1.1.1.0.0.0.1.1

%e .0.0.0.1.1.1.0.0

%e .1.1.0.1.1.0.1.1

%e .1.1.1.0.0.1.1.1

%K nonn

%O 1,3

%A _R. H. Hardin_