A147496 - OEIS

A147496

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11101-10111 pattern in any orientation.

1, 1, 1, 1, 5, 9, 25, 45, 145, 605, 4313, 20593, 130161, 816717, 6861977, 63223597, 879585069, 10212102803

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

OFFSET

1,5

LINKS

EXAMPLE

Maximal 8 X 8 example

.1.1.0.1.1.1.0.1

.1.0.0.1.0.1.1.1

.1.1.0.0.0.0.0.0

.0.1.0.0.0.0.1.1

.1.1.0.0.0.0.1.0

.0.0.0.0.0.0.1.1

.1.1.1.0.1.0.0.1

.1.0.1.1.1.0.1.1

CROSSREFS

KEYWORD

nonn

AUTHOR

STATUS

approved