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.

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

Links

Table of n, a(n) for n=1..23.

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

Adjacent sequences: A146214 A146215 A146216 * A146218 A146219 A146220

Keyword

nonn

Author

R. H. Hardin

Status

approved