A146705 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 21, 47, 269, 1463, 8149, 63091, 761263, 8894963, 159626291, 3010312887, 80637272407

Offset

1,6

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.0.0.0.1.1.1.1.0
.1.1.0.0.1.0.0.0
.1.1.1.1.0.1.0.0
.0.0.1.0.1.1.1.1
.0.0.0.1.0.0.1.1
.0.1.1.1.1.0.0.0
.0.1.1.0.0.0.0.0

Crossrefs

Sequence in context: A250777 A327302 A156966 * A146713 A140681 A262423

Adjacent sequences: A146702 A146703 A146704 * A146706 A146707 A146708

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved