A147008 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 00100-11111-00100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 4, 1, 6, 1, 13, 3, 37, 7, 103, 14, 365

Offset

1,9

Links

Table of n, a(n) for n=1..21.

Example

Maximal 9 X 9 example
.0.0.0.0.1.0.0.0.0
.0.0.1.1.1.1.1.0.0
.0.1.0.0.1.0.0.1.0
.0.1.0.0.0.0.0.1.0
.1.1.1.0.0.0.1.1.1
.0.1.0.0.0.0.0.1.0
.0.1.0.0.1.0.0.1.0
.0.0.1.1.1.1.1.0.0
.0.0.0.0.1.0.0.0.0

Crossrefs

Sequence in context: A353318 A239871 A147389 * A147365 A147064 A147228

Adjacent sequences: A147005 A147006 A147007 * A147009 A147010 A147011

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved