A147050 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-1100-0111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 5, 17, 45, 201, 861, 4033, 28285, 222873, 2292605, 26123281, 391420701, 6423928729

Offset

1,6

Links

Table of n, a(n) for n=1..17.

Example

Maximal 8 X 8 example
.0.0.1.0.0.0.1.0
.0.0.1.1.0.0.1.1
.1.1.1.0.1.1.1.0
.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0
.0.1.1.1.0.1.1.1
.1.1.0.0.1.1.0.0
.0.1.0.0.0.1.0.0

Crossrefs

Sequence in context: A320554 A218135 A271122 * A147397 A147193 A271302

Adjacent sequences: A147047 A147048 A147049 * A147051 A147052 A147053

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved