A147117 - OEIS

A147117

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1000-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 33, 33, 105, 105, 733, 733, 10679, 10679, 271641, 271641, 6329349, 6329349

(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

.1.1.1.1.0.1.1.1.1

.0.1.0.0.0.0.0.1.0

.0.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.0.1.0

.1.1.1.1.0.1.1.1.1

.1.0.0.0.0.0.0.0.1

CROSSREFS

Sequence in context: A146190 A147125 A147109 * A147263 A146234 A146182

Adjacent sequences: A147114 A147115 A147116 * A147118 A147119 A147120

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved