A146633 - OEIS

A146633

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1010-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 25, 53, 269, 1425, 7687, 57643, 735315, 7616377, 142631981, 2418705027, 66038837775

OFFSET

1,6

LINKS

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.1.0.1.0

.1.1.1.0.1.1.1.1

.0.1.0.0.0.0.1.0

.1.1.0.0.0.0.0.0

.0.0.0.0.0.0.1.1

.0.1.0.0.0.0.1.0

.1.1.1.1.0.1.1.1

.0.1.0.1.0.0.1.0

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved