A147037 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-0100-1111-0100 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 5, 5, 17, 17, 39, 39, 181, 181, 1975

Offset

1,9

Links

Table of n, a(n) for n=1..17.

Example

Maximal 9 X 9 example
.0.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0.0
.1.1.1.1.0.1.1.1.1
.0.0.1.0.0.0.1.0.0
.0.0.0.0.0.0.0.0.0
.0.0.1.0.0.0.1.0.0
.1.1.1.1.0.1.1.1.1
.0.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0.0

Crossrefs

Sequence in context: A146719 A147469 A146274 * A146796 A146836 A146780

Adjacent sequences: A147034 A147035 A147036 * A147038 A147039 A147040

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved