A147323 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 00100-00100-00100-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 3, 6, 13, 25, 41, 67, 149, 438

Offset

1,8

Links

Table of n, a(n) for n=1..15.

Example

Maximal 8 X 8 example
.1.0.0.1.1.1.1.1
.1.0.0.0.0.1.0.0
.1.1.1.1.0.1.0.0
.1.0.0.0.0.1.0.1
.1.0.1.0.0.0.0.1
.0.0.1.0.1.1.1.1
.0.0.1.0.0.0.0.1
.1.1.1.1.1.0.0.1

Crossrefs

Sequence in context: A032287 A199403 A006017 * A047183 A047194 A048039

Adjacent sequences: A147320 A147321 A147322 * A147324 A147325 A147326

Keyword

nonn

Author

R. H. Hardin

Status

approved