A147090 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 10001-11111 pattern in any orientation.

1, 1, 1, 1, 5, 13, 25, 51, 215, 1059, 6091, 34649, 217439, 1714483, 16064320, 187492557

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.1.1.0.1.1.1.1.1
.1.0.0.1.0.0.0.1
.1.0.0.0.0.0.0.0
.1.0.0.0.0.0.1.1
.1.1.0.0.0.0.0.1
.0.0.0.0.0.0.0.1
.1.0.0.0.1.0.0.1
.1.1.1.1.1.0.1.1

Crossrefs

Sequence in context: A147408 A241657 A249513 * A097117 A146140 A146283

Adjacent sequences: A147087 A147088 A147089 * A147091 A147092 A147093

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved