A146673 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0110 pattern in any orientation.

1, 1, 1, 1, 1, 17, 51, 293, 1459, 7621, 56935, 702993, 8365419, 152139369, 2979251133

Offset

1,6

Links

Table of n, a(n) for n=1..15.

Example

Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.0.1.0.0.1.1.1.0
.1.1.0.0.0.0.1.1
.1.1.1.0.0.1.0.0
.0.0.1.0.0.1.1.1
.1.1.0.0.0.0.1.1
.0.1.1.1.0.0.1.0
.0.1.1.0.0.0.0.0

Crossrefs

Sequence in context: A214660 A258598 A223906 * A330390 A078757 A041560

Adjacent sequences: A146670 A146671 A146672 * A146674 A146675 A146676

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved