A146263 - OEIS

A146263

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-101 pattern in any orientation.

1, 1, 1, 1, 5, 33, 133, 785, 3005, 17673, 190185, 2271593, 28110409, 628123625, 14202428649, 408602739063, 12463530182045

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

OFFSET

1,5

LINKS

EXAMPLE

Maximal 8 X 8 example

.1.0.1.0.0.0.0.0

.1.1.1.0.0.1.1.0

.1.1.0.0.0.0.1.1

.0.0.0.0.0.1.1.1

.1.1.1.0.0.0.0.0

.1.1.0.0.0.0.1.1

.0.1.1.0.0.1.1.1

.0.0.0.0.0.1.0.1

CROSSREFS

KEYWORD

nonn

AUTHOR

STATUS

approved