A147140 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 87, 159, 1731, 3703, 46857, 115477, 2401469, 6836409, 422076549, 1471030175, 219087502441, 947868551011, 168623871394941, 877710670520219, 224838418801232961, 1395473160547757611

Offset

1,9

Links

Table of n, a(n) for n=1..24.

Example

Maximal 9 X 9 example
.0.0.1.1.0.1.1.0.0
.0.1.1.0.0.0.1.1.0
.1.1.0.0.0.0.0.1.1
.1.0.1.1.0.1.1.0.1
.0.1.1.0.0.0.1.1.0
.1.1.0.1.0.1.0.1.1
.1.0.1.1.0.1.1.0.1
.0.1.1.0.0.0.1.1.0
.1.1.0.0.0.0.0.1.1

Crossrefs

Sequence in context: A039489 A363281 A031891 * A044257 A044638 A324111

Adjacent sequences: A147137 A147138 A147139 * A147141 A147142 A147143

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved