A147105 - OEIS

A147105

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 13, 21, 51, 105, 313, 705, 2345, 6341, 26177, 91001, 474255, 1837677, 10745995, 49191077, 334389565, 1781473499

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

OFFSET

1,8

LINKS

EXAMPLE

Maximal 8 X 8 example

.0.0.0.1.1.1.0.0

.0.0.1.1.0.0.0.0

.1.0.1.0.1.1.1.0

.1.0.1.0.0.0.1.1

.1.1.0.0.0.1.0.1

.0.1.1.1.0.1.0.1

.0.0.0.0.1.1.0.0

.0.0.1.1.1.0.0.0

CROSSREFS

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved