A147210 Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0111-0011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 19, 31, 671, 1393, 17427, 44279, 1106663, 3412457, 320938143, 1265591403, 240272372207, 1198689233053, 298357443446865, 1842799915443649, 817026217664351385, 6225260273965873969

Offset

1,7

Links

Table of n, a(n) for n=1..22.

Example

Maximal 8 X 8 example
.0.1.1.0.0.1.1.0
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1
.1.0.0.0.0.0.0.1
.0.0.1.0.0.1.0.0
.0.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1
.1.1.0.0.0.0.1.1

Crossrefs

Sequence in context: A146691 A146784 A147240 * A146816 A146659 A160220

Adjacent sequences: A147207 A147208 A147209 * A147211 A147212 A147213

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved