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A147488
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11011-01110-00100 pattern in any orientation.
0
1, 1, 1, 1, 1, 5, 20, 49, 167, 643, 3053, 16577, 118904, 896633, 8867027, 91561000, 1224859380, 17454229913
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.1.1.0.1.1
.1.0.0.0.1.1.1.0
.1.1.0.0.0.1.0.1
.0.1.1.0.0.0.1.1
.1.1.0.0.0.1.1.0
.1.0.1.0.0.0.1.1
.0.1.1.1.0.0.0.1
.1.1.0.1.1.0.0.0
CROSSREFS
Sequence in context: A160749 A147002 A005287 * A297569 A190094 A134481
KEYWORD
nonn
AUTHOR
STATUS
approved