A147230 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 11011-01110 pattern in any orientation.

1, 1, 1, 1, 5, 9, 28, 67, 302, 1369, 9282, 54141, 470976, 3945073, 47144695, 569244886

Offset

1,5

Links

Table of n, a(n) for n=1..16.

Example

Maximal 8 X 8 example
.1.0.0.0.0.0.0.0
.1.1.0.1.1.0.1.1
.0.1.0.0.1.1.1.0
.1.1.0.0.0.0.0.1
.1.0.0.0.0.0.1.1
.0.1.1.1.0.0.1.0
.1.1.0.1.1.0.1.1
.0.0.0.0.0.0.0.1

Crossrefs

Sequence in context: A193316 A026587 A147367 * A192914 A303676 A163779

Adjacent sequences: A147227 A147228 A147229 * A147231 A147232 A147233

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved