login
A147104
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 7, 7, 15, 15, 33, 33, 93, 93, 429, 429, 2069, 2069, 10289, 10289, 55429, 55429, 387995, 387995
OFFSET
1,9
EXAMPLE
Maximal 9 X 9 example
.0.0.0.1.0.1.0.0.0
.0.0.0.1.0.1.0.0.0
.0.0.1.1.0.1.1.0.0
.1.1.1.0.0.0.1.1.1
.0.0.0.0.0.0.0.0.0
.1.1.1.0.0.0.1.1.1
.0.0.1.1.0.1.1.0.0
.0.0.0.1.0.1.0.0.0
.0.0.0.1.0.1.0.0.0
CROSSREFS
Sequence in context: A052551 A147096 A147252 * A147381 A146035 A147190
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved