A146785 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1100-1111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 57, 57, 369, 369, 5039, 5039, 105411, 105411, 2937697, 2937697, 116344821, 116344821

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.1.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.0.1
.1.1.1.0.0.0.1.1.1
.1.1.0.0.0.0.0.1.1
.0.0.0.0.0.0.0.0.0
.1.1.0.0.0.0.0.1.1
.1.1.1.0.0.0.1.1.1
.1.0.0.0.0.0.0.0.1
.1.0.0.0.0.0.0.0.1

Crossrefs

Sequence in context: A147164 A146692 A146439 * A146572 A147211 A147241

Adjacent sequences: A146782 A146783 A146784 * A146786 A146787 A146788

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved