A146234 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 113, 113, 1393, 1393, 59521, 59521, 1585365, 1585365, 62771429, 62771429, 6390256297, 6390256297, 1169289395909, 1169289395909

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.1.0.0.1.0.0
.1.1.1.0.0.1.1.1
.1.1.0.0.0.0.1.1
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.1.1.0.0.0.0.1.1
.1.1.1.0.0.1.1.1
.0.0.1.0.0.1.0.0

Crossrefs

Sequence in context: A147109 A147117 A147263 * A146182 A147149 A147277

Adjacent sequences: A146231 A146232 A146233 * A146235 A146236 A146237

Keyword

nonn

Author

R. H. Hardin

Status

approved