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

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
.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
.0.1.0.0.1.0.0.1.0
.0.0.1.1.1.1.1.0.0
.0.0.0.0.1.0.0.0.0

Crossrefs

Sequence in context: A281631 A259230 A278756 * A145629 A193633 A176289

Adjacent sequences: A147324 A147325 A147326 * A147328 A147329 A147330

Keyword

nonn

Author

R. H. Hardin

Status

approved