A147254 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11100-00100-00111 pattern in any orientation.

1, 1, 1, 1, 5, 5, 21, 29, 145, 485, 3243, 11105, 102013, 454621, 6519613, 40834561, 722449417

Offset

1,5

Links

Table of n, a(n) for n=1..17.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.1
.0.0.1.0.0.0.0.1
.0.0.1.0.0.1.1.1
.1.1.1.0.0.1.0.0
.1.0.0.0.0.1.0.0
.1.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A279666 A376977 A283046 * A241864 A243121 A007028

Adjacent sequences: A147251 A147252 A147253 * A147255 A147256 A147257

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved