A147203 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 49, 49, 205, 205, 2349, 2349, 61265, 61265, 1411269, 1411269, 32593981, 32593981

Offset

1,9

Links

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

Example

Maximal 9 X 9 example
.0.0.1.1.0.1.1.0.0
.0.0.0.1.0.1.0.0.0
.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
.0.0.0.1.0.1.0.0.0
.0.0.1.1.0.1.1.0.0

Crossrefs

Sequence in context: A146873 A146793 A146801 * A146777 A147053 A146857

Adjacent sequences: A147200 A147201 A147202 * A147204 A147205 A147206

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved