A147246 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1101-0111-0010 pattern in any orientation.

1, 1, 1, 1, 5, 21, 67, 345, 1649, 10337, 85161, 930265, 12022615, 198707417, 3901444367

Offset

1,5

Links

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

Example

Maximal 8 X 8 example
.1.0.1.1.0.0.0.0
.1.1.1.0.0.0.0.0
.0.1.0.0.0.0.1.0
.1.0.1.1.0.1.1.1
.1.1.1.0.1.1.0.1
.0.1.0.0.0.0.1.0
.0.0.0.0.0.1.1.1
.0.0.0.0.1.1.0.1

Crossrefs

Sequence in context: A272987 A272310 A273740 * A335982 A271282 A203287

Adjacent sequences: A147243 A147244 A147245 * A147247 A147248 A147249

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved