A147240 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1101-0111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 19, 31, 655, 1339, 18309, 48007, 1442201, 4567021, 367217353, 1460020323, 228615404039, 1133359885719, 280150745688529, 1717585325345099, 785288102542995777, 5945777223826707809

Offset

1,7

Links

Table of n, a(n) for n=1..22.

Example

Maximal 8 X 8 example
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1
.1.0.0.0.0.0.0.1
.0.0.1.0.0.1.0.0
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1
.0.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A087764 A146691 A146784 * A147210 A146816 A146659

Adjacent sequences: A147237 A147238 A147239 * A147241 A147242 A147243

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved