A147327 - OEIS

A147327

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 6, 1, 28, 9, 150, 25, 1118, 57, 7823, 349, 97756, 3222, 1845246, 35623, 42655192, 520596, 1288627017, 9629183

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

OFFSET

1,9

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.1.0.0.0.0

.0.0.1.1.1.1.1.0.0

.0.1.0.0.1.0.0.1.0

.1.1.1.1.0.1.1.1.1

.0.1.0.0.1.0.0.1.0

.0.0.1.1.1.1.1.0.0

.0.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A259230 A375550 A278756 * A145629 A193633 A176289

Adjacent sequences: A147324 A147325 A147326 * A147328 A147329 A147330

KEYWORD

nonn

AUTHOR

R. H. Hardin

STATUS

approved