A146668 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0111-0110 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 253, 253, 3643, 3643, 105629, 105629, 2607651, 2607651, 96901053, 96901053

Offset

1,9

Links

Table of n, a(n) for n=1..22.

Example

Maximal 9 X 9 example
.0.0.1.0.0.0.1.0.0
.0.0.1.1.0.1.1.0.0
.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
.0.1.0.0.0.0.0.1.0
.0.1.1.1.0.1.1.1.0
.0.0.1.1.0.1.1.0.0
.0.0.1.0.0.0.1.0.0

Crossrefs

Sequence in context: A146777 A147053 A146857 * A146732 A146588 A146628

Adjacent sequences: A146665 A146666 A146667 * A146669 A146670 A146671

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved