A146217 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

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

.0.1.0.0.0.0.1.0

.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