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A147487
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11011-01110-00100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 4, 7, 13, 21, 47, 71, 266, 697, 2575, 7222, 30644, 93493, 472633, 1837587, 10941522, 49363521, 346195883, 1801870833
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.1.0.0.1.1.0.1.1
.1.1.0.0.1.1.1.0
.0.1.1.0.0.1.0.0
.1.1.0.0.0.0.0.1
.1.0.0.0.0.0.1.1
.0.0.1.0.0.1.1.0
.0.1.1.1.0.0.1.1
.1.1.0.1.1.0.0.1
CROSSREFS
Sequence in context: A100848 A051458 A068940 * A190845 A190805 A008471
KEYWORD
nonn
AUTHOR
STATUS
approved