A147367 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 01110-11111 pattern in any orientation.

1, 1, 1, 1, 5, 9, 28, 65, 286, 1283, 8624, 48653, 407612, 3268073, 37940635, 437037462

Offset

1,5

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.1.0.0.0.0.0.0.0
.1.1.0.1.1.1.1.1
.1.1.0.0.1.1.1.0
.1.1.0.0.0.0.0.1
.1.0.0.0.0.0.1.1
.0.1.1.1.0.0.1.1
.1.1.1.1.1.0.1.1
.0.0.0.0.0.0.0.1

Crossrefs

Sequence in context: A301747 A193316 A026587 * A147230 A192914 A303676

Adjacent sequences: A147364 A147365 A147366 * A147368 A147369 A147370

Keyword

nonn

Author

R. H. Hardin

Status

approved