A147081 - OEIS

A147081

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11111-10000 pattern in any orientation.

%I #4 Mar 31 2012 12:35:15

%S 1,1,1,1,1,1,1,5,11,23,38,81,220,567,1681,5209,18445,63999,259065,

%T 1109285,5269124,26433601,148185912,862407722

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 10000-11111-10000 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.1.0.1.0

%e .1.1.1.1.1.0.1.0

%e .0.0.0.0.1.0.1.0

%e .1.1.1.0.0.0.1.0

%e .0.1.0.0.0.1.1.1

%e .0.1.0.1.0.0.0.0

%e .0.1.0.1.1.1.1.1

%e .0.1.0.1.0.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008