A147222 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0101 pattern in any orientation.

1, 1, 1, 1, 1, 21, 45, 251, 1189, 5949, 38111, 398367, 3732199

Offset

1,6

Links

Table of n, a(n) for n=1..13.

Example

Maximal 8 X 8 example
.0.0.0.0.1.0.1.0
.1.1.0.0.1.1.1.0
.0.1.0.0.0.0.1.1
.1.1.1.0.0.1.0.0
.0.0.1.0.0.1.1.1
.1.1.0.0.0.0.1.0
.0.1.1.1.0.0.1.1
.0.1.0.1.0.0.0.0

Crossrefs

Sequence in context: A063500 A372290 A102603 * A199767 A044098 A044479

Adjacent sequences: A147219 A147220 A147221 * A147223 A147224 A147225

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved