A147400 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 3, 7, 15, 29, 107, 505, 2403, 11235, 68883, 550857, 5140463, 52360741, 625116575, 9135765233, 158905603757, 3203687852735, 75422308943617

Offset

1,6

Links

Table of n, a(n) for n=1..22.

Example

Maximal 8 X 8 example
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.0.0.0.1.0.0.0
.0.0.0.0.1.1.1.0
.0.0.1.1.0.1.1.1
.0.0.0.1.1.0.0.1
.0.0.0.1.1.0.0.0
.0.0.0.0.1.1.0.0

Crossrefs

Sequence in context: A284421 A283864 A283606 * A002545 A153114 A325664

Adjacent sequences: A147397 A147398 A147399 * A147401 A147402 A147403

Keyword

nonn

Author

R. H. Hardin

Status

approved