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A147096
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 7, 7, 15, 15, 31, 31, 73, 73, 307, 307, 1451, 1451, 6775, 6775, 33773, 33773, 192865
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
.0.0.0.1.0.1.0.0.0
.1.1.1.1.0.1.1.1.1
.0.0.0.0.0.0.0.0.0
.1.1.1.1.0.1.1.1.1
.0.0.0.1.0.1.0.0.0
.0.0.0.1.0.1.0.0.0
.0.0.0.1.0.1.0.0.0
CROSSREFS
Sequence in context: A357215 A147402 A052551 * A147252 A147104 A147381
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved