A147486 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11011-01110-00100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 2, 1, 3, 1, 5, 1, 12, 3, 33, 8, 104, 23, 411, 63, 1754, 191, 8637, 685, 51410, 3493

Offset

1,7

Links

Table of n, a(n) for n=1..26.

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.1.1.0.1.1.0.0
.0.1.0.1.1.1.0.1.0
.0.1.1.0.1.0.1.1.0
.0.0.1.1.0.1.1.0.0
.0.1.1.0.1.0.1.1.0
.0.1.0.1.1.1.0.1.0
.0.0.1.1.0.1.1.0.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A129982 A052552 A147000 * A168018 A173238 A173284

Adjacent sequences: A147483 A147484 A147485 * A147487 A147488 A147489

Keyword

nonn

Author

R. H. Hardin

Status

approved