A146838 - OEIS

A146838

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1001-1111-0100 pattern in any orientation.

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

%S 1,1,1,1,1,21,51,217,1233,6449,45131,442147,4714111,71906123,

%T 1148024329,26742683865,642806579973

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1001-1111-0100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.1.1.0

%e .0.1.0.0.0.0.1.0

%e .1.1.1.1.0.0.1.1

%e .1.0.0.1.0.1.1.0

%e .0.1.1.0.1.0.0.1

%e .1.1.0.0.1.1.1.1

%e .0.1.0.0.0.0.1.0

%e .0.1.1.0.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008