A147034 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 5, 25, 85, 499, 2253, 9751, 103141, 1030207, 12930523, 188986765, 3964919203, 79856104275, 2515127447393

Offset

1,6

Links

Table of n, a(n) for n=1..18.

Example

Maximal 8 X 8 example
.0.1.0.0.0.0.1.0
.0.1.1.1.0.0.1.0
.1.1.0.0.1.1.1.1
.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0
.1.1.1.1.0.0.1.1
.0.1.0.0.1.1.1.0
.0.1.0.0.0.0.1.0

Crossrefs

Sequence in context: A018212 A181477 A147274 * A146460 A223840 A083090

Adjacent sequences: A147031 A147032 A147033 * A147035 A147036 A147037

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved