A146396 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1100-0111 pattern in any orientation.

1, 1, 1, 1, 9, 21, 85, 433, 2775, 20277, 189267, 2151189, 36658025, 657296273, 17789206817

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.1.1.1.0.1.1.1.0
.0.0.1.1.0.0.1.1
.1.0.0.1.0.0.0.1
.1.1.0.0.1.1.1.0
.0.1.1.1.0.0.1.1
.1.0.0.0.1.0.0.1
.1.1.0.0.1.1.0.0
.0.1.1.1.0.1.1.1

Crossrefs

Sequence in context: A137340 A075640 A147480 * A146681 A269633 A279389

Adjacent sequences: A146393 A146394 A146395 * A146397 A146398 A146399

Keyword

nonn

Author

R. H. Hardin

Status

approved