A146732 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1110-0111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 253, 253, 4269, 4269, 109305, 109305, 2719409, 2719409, 106590781, 106590781

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
.0.1.0.0.0.0.0.1.0
.0.1.1.1.0.1.1.1.0
.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
.0.1.1.1.0.1.1.1.0
.0.1.0.0.0.0.0.1.0
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A147053 A146857 A146668 * A146588 A146628 A146636

Adjacent sequences: A146729 A146730 A146731 * A146733 A146734 A146735

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved