A146225 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111 pattern in any orientation.

1, 1, 1, 1, 9, 13, 39, 69, 2575, 6405, 191203, 599559, 31751065, 124920743, 19072164165, 96207487051, 23729375699967, 150729249130871, 86943333060607105, 701895334984042253, 791712727158897187729

Offset

1,5

Links

Table of n, a(n) for n=1..21.

Example

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

Crossrefs

Sequence in context: A147352 A147391 A241677 * A219257 A200537 A160118

Adjacent sequences: A146222 A146223 A146224 * A146226 A146227 A146228

Keyword

nonn

Author

R. H. Hardin

Status

approved