A147180 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-0101 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 53, 53, 329, 329, 3195, 3195, 60697, 60697, 1822001, 1822001, 62512113, 62512113

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
.1.0.0.0.0.0.0.0.1
.1.1.1.1.0.1.1.1.1
.0.1.0.1.0.1.0.1.0
.0.0.0.0.0.0.0.0.0
.0.1.0.1.0.1.0.1.0
.1.1.1.1.0.1.1.1.1
.1.0.0.0.0.0.0.0.1
.0.0.0.0.0.0.0.0.0

Crossrefs

Sequence in context: A146708 A146463 A146841 * A146644 A146612 A146849

Adjacent sequences: A147177 A147178 A147179 * A147181 A147182 A147183

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved