A147263 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 105, 105, 825, 825, 13503, 13503, 390699, 390699, 9339771, 9339771

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.1.0.0.0.0.0.0.0.1
.1.1.1.0.0.0.1.1.1
.0.0.1.1.0.1.1.0.0
.0.0.1.0.0.0.1.0.0
.0.0.0.0.0.0.0.0.0
.0.0.1.0.0.0.1.0.0
.0.0.1.1.0.1.1.0.0
.1.1.1.0.0.0.1.1.1
.1.0.0.0.0.0.0.0.1

Crossrefs

Sequence in context: A147125 A147109 A147117 * A146234 A146182 A147149

Adjacent sequences: A147260 A147261 A147262 * A147264 A147265 A147266

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved