A146700 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 329, 329, 4359, 4359, 91969, 91969, 2747799, 2747799, 116126725, 116126725

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
.1.1.1.1.0.1.1.1.1
.0.0.1.1.0.1.1.0.0
.0.0.0.0.0.0.0.0.0
.0.0.1.1.0.1.1.0.0
.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

Crossrefs

Sequence in context: A146628 A146636 A146833 * A146708 A146463 A146841

Adjacent sequences: A146697 A146698 A146699 * A146701 A146702 A146703

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved