A147355 - OEIS

A147355

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0110-0110-1111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:16

%S 1,1,1,1,1,1,1,6,9,38,25,340,57,1815,551,17400,8604,372235,122881,

%T 11641876,1647352,359458545,42868635,13529698097,1998622860

%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0110-0110-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.1.1.1.0.0

%e .0.0.0.1.1.0.0.0

%e .1.0.0.1.1.0.0.1

%e .1.1.1.0.0.1.1.1

%e .1.0.0.1.1.0.0.1

%e .0.0.0.1.1.0.0.0

%e .0.0.1.1.1.1.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_