A146785 - OEIS

A146785

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 57, 57, 369, 369, 5039, 5039, 105411, 105411, 2937697, 2937697, 116344821, 116344821

(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

.1.0.0.0.0.0.0.0.1

.1.1.1.0.0.0.1.1.1

.1.1.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.0.0

.1.1.0.0.0.0.0.1.1

.1.1.1.0.0.0.1.1.1

.1.0.0.0.0.0.0.0.1

CROSSREFS

Sequence in context: A147164 A146692 A146439 * A146572 A147211 A147241

Adjacent sequences: A146782 A146783 A146784 * A146786 A146787 A146788

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved