A147393 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1000-1111-0001-0001 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 13, 19, 229, 391, 2411, 4925

Offset

1,9

Links

Table of n, a(n) for n=1..14.

Example

Maximal 9 X 9 example
.1.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.0.1
.1.1.1.1.0.1.1.1.1
.0.0.0.1.0.1.0.0.0
.1.0.0.1.0.1.0.0.1
.1.0.0.0.0.0.0.0.1
.1.1.1.1.0.1.1.1.1
.0.0.0.1.0.1.0.0.0
.0.0.0.1.0.1.0.0.0

Crossrefs

Sequence in context: A241246 A153266 A166664 * A088187 A146047 A343034

Adjacent sequences: A147390 A147391 A147392 * A147394 A147395 A147396

Keyword

nonn

Author

R. H. Hardin

Status

approved