A147000 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 00100-00100-11111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 2, 1, 3, 1, 5, 1, 11, 3, 31, 8, 90, 23, 344, 61, 1429, 183, 6788, 609, 37364, 3021, 252513

Offset

1,7

Links

Table of n, a(n) for n=1..27.

Example

Maximal 9 X 9 example
.0.0.0.0.0.0.0.0.0
.0.0.1.1.1.1.1.0.0
.0.1.0.0.1.0.0.1.0
.0.1.0.0.1.0.0.1.0
.0.1.1.1.0.1.1.1.0
.0.1.0.0.1.0.0.1.0
.0.1.0.0.1.0.0.1.0
.0.0.1.1.1.1.1.0.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A126132 A129982 A052552 * A147486 A168018 A173238

Adjacent sequences: A146997 A146998 A146999 * A147001 A147002 A147003

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved