A147192 - OEIS

A147192

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11000-01110-00011 pattern in any orientation.

1, 1, 1, 1, 5, 9, 25, 39, 213, 729, 5371, 22321, 227621, 1304481, 19507517, 156958957

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,5

LINKS

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.0.1.1

.0.1.1.0.1.1.1.0

.0.1.0.1.1.0.0.0

.1.1.0.0.0.0.0.1

.1.0.0.0.0.0.1.1

.0.0.0.1.1.0.1.0

.0.1.1.1.0.1.1.0

.1.1.0.0.0.1.0.0

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved