A147029 - OEIS

A147029

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 81, 81, 593, 593, 11281, 11281, 273235, 273235, 6759617, 6759617

(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

.0.0.1.0.0.0.1.0.0

.0.0.1.1.0.1.1.0.0

.1.1.1.0.0.0.1.1.1

.0.0.1.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.1.0.0

.1.1.1.0.0.0.1.1.1

.0.0.1.1.0.1.1.0.0

.0.0.1.0.0.0.1.0.0

CROSSREFS

Sequence in context: A356839 A147172 A146825 * A146258 A146173 A146190

Adjacent sequences: A147026 A147027 A147028 * A147030 A147031 A147032

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved