A147479 - OEIS

A147479

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-1100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 9, 20, 33, 56, 123, 372, 1117, 3761, 13503

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

OFFSET

1,8

LINKS

EXAMPLE

Maximal 8 X 8 example

.0.0.0.0.1.1.1.0

.1.1.0.0.1.1.1.0

.1.1.1.1.0.1.0.0

.1.1.0.0.0.1.0.0

.0.0.1.0.0.0.1.1

.0.0.1.0.1.1.1.1

.0.1.1.1.0.0.1.1

.0.1.1.1.0.0.0.0

CROSSREFS

KEYWORD

nonn

AUTHOR

STATUS

approved