A147164 - OEIS

A147164

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 57, 57, 317, 317, 3151, 3151, 61021, 61021, 1767277, 1767277, 57009275, 57009275

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

OFFSET

1,9

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.0.0.0.1.0.1.0.0.0

.1.0.1.1.0.1.1.0.1

.1.1.1.0.0.0.1.1.1

.0.0.0.0.0.0.0.0.0

.1.1.1.0.0.0.1.1.1

.1.0.1.1.0.1.1.0.1

.0.0.0.1.0.1.0.0.0

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146684 A146652 A147133 * A146692 A146439 A146785

Adjacent sequences: A147161 A147162 A147163 * A147165 A147166 A147167

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved