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A147331
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 5, 21, 42, 179, 648, 2171, 10276, 78975, 494260
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.0.0.0
.0.0.1.1.1.1.1.0
.0.0.0.0.1.0.0.0
.0.0.0.0.1.0.0.0
.0.0.0.1.0.0.0.0
.0.0.0.1.0.0.0.0
.0.1.1.1.1.1.0.0
.0.0.0.1.0.0.0.0
CROSSREFS
Sequence in context: A054286 A366346 A031292 * A078371 A265056 A049741
KEYWORD
nonn
AUTHOR
STATUS
approved