A146652 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 57, 57, 265, 265, 2569, 2569, 62981, 62981, 1534149, 1534149, 39874393, 39874393

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
.1.0.0.0.0.0.0.0.1
.1.1.1.0.0.0.1.1.1
.1.0.1.0.0.0.1.0.1
.0.0.0.0.0.0.0.0.0
.1.0.1.0.0.0.1.0.1
.1.1.1.0.0.0.1.1.1
.1.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.0.1

Crossrefs

Sequence in context: A146399 A146407 A146684 * A147133 A147164 A146692

Adjacent sequences: A146649 A146650 A146651 * A146653 A146654 A146655

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved