A147184 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1111-0101 pattern in any orientation.

1, 1, 1, 1, 5, 25, 51, 201, 1169, 6421, 46097, 426039, 4475987, 69749651, 1072403047

Offset

1,5

Links

Table of n, a(n) for n=1..15.

Example

Maximal 8 X 8 example
.0.1.1.0.0.1.1.0
.0.0.1.0.0.0.1.1
.0.1.1.0.0.0.1.0
.0.0.1.1.0.0.1.1
.1.1.0.0.1.1.0.0
.0.1.0.0.0.1.1.0
.1.1.0.0.0.1.0.0
.0.1.1.0.0.1.1.0

Crossrefs

Sequence in context: A136911 A101654 A043106 * A036133 A062671 A225494

Adjacent sequences: A147181 A147182 A147183 * A147185 A147186 A147187

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved