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A147351
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01010-11111-00100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 3, 13, 21, 43, 69, 199, 467, 1790, 4987
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.0.1.0.0.1.0.1.0
.1.1.0.1.1.1.1.1
.0.1.1.0.0.1.0.0
.1.1.0.0.0.0.1.0
.0.1.0.0.0.0.1.1
.0.0.1.0.0.1.1.0
.1.1.1.1.1.0.1.1
.0.1.0.1.0.0.1.0
CROSSREFS
Sequence in context: A050903 A117766 A243162 * A147097 A147105 A258774
KEYWORD
nonn
AUTHOR
STATUS
approved