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A146217
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 101-111-010 pattern in any orientation.
0
1, 1, 3, 1, 7, 1, 112, 79, 2558, 1063, 209802, 27065, 20175581, 2447221, 6126604790, 890042930, 4313282889342, 407961935451, 7026857211622192, 392627753805036, 22754595511201832755, 1023436778780854869, 178462597153459704022556
OFFSET
1,3
EXAMPLE
Maximal 8 X 8 example
.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
.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: A146430 A146281 A146265 * A146007 A061782 A074625
KEYWORD
nonn
AUTHOR
STATUS
approved