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A146218
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 101-111-010 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 10, 5, 44, 17, 490, 45, 4847, 317, 94850, 5736, 2753328, 99087, 124970926, 2137142, 7708832169, 81606063, 748069343112, 5341611544, 110489144610789, 471313494449
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.1.0.1.0.0.1.0.1
.1.1.1.0.0.1.1.1
.0.1.0.0.0.0.1.0
.0.0.0.0.0.0.0.0
.0.0.0.0.0.0.0.0
.0.1.0.0.0.0.1.0
.1.1.1.0.0.1.1.1
.1.0.1.0.0.1.0.1
CROSSREFS
Sequence in context: A183132 A141321 A146266 * A033962 A241360 A096898
KEYWORD
nonn
AUTHOR
STATUS
approved