A147358 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0110-0110-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 3, 8, 19, 34, 51, 134, 355, 989, 3419, 12452

Offset

1,7

Links

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

Example

Maximal 8 X 8 example
.0.0.0.1.1.1.1.0
.1.0.0.0.1.1.0.0
.1.1.1.0.1.1.0.0
.1.1.1.0.0.0.0.1
.1.0.0.0.0.1.1.1
.0.0.1.1.0.1.1.1
.0.0.1.1.0.0.0.1
.0.1.1.1.1.0.0.0

Crossrefs

Sequence in context: A113535 A184444 A139020 * A209367 A086167 A083186

Adjacent sequences: A147355 A147356 A147357 * A147359 A147360 A147361

Keyword

nonn

Author

R. H. Hardin

Status

approved