A147214 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-0011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 9, 9, 23, 23, 55, 55, 315, 315, 2117, 2117, 14227

Offset

1,11

Links

Table of n, a(n) for n=1..23.

Example

Maximal 11 X 11 example
.0.0.1.1.0.0.0.1.1.0.0
.0.0.1.1.0.0.0.1.1.0.0
.1.1.0.1.1.0.1.1.0.1.1
.1.1.1.0.1.0.1.0.1.1.1
.0.0.1.1.0.0.0.1.1.0.0
.0.0.0.0.0.0.0.0.0.0.0
.0.0.1.1.0.0.0.1.1.0.0
.1.1.1.0.1.0.1.0.1.1.1
.1.1.0.1.1.0.1.1.0.1.1
.0.0.1.1.0.0.0.1.1.0.0
.0.0.1.1.0.0.0.1.1.0.0

Crossrefs

Sequence in context: A146695 A146442 A147128 * A146820 A146663 A146394

Adjacent sequences: A147211 A147212 A147213 * A147215 A147216 A147217

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved