A147474 - OEIS

A147474

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.

1, 1, 1, 1, 1, 3, 11, 35, 119, 483, 1553, 7807, 47813, 363745, 2696139

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

OFFSET

1,6

LINKS

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.0.0.1.1

.0.0.1.0.1.1.1.1

.1.1.1.1.0.0.1.0

.0.0.1.1.0.0.1.0

.0.1.0.0.1.1.0.0

.0.1.0.0.1.1.1.1

.1.1.1.1.0.1.0.0

.1.1.0.0.0.1.0.0

CROSSREFS

KEYWORD

nonn

AUTHOR

STATUS

approved