A147058 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-1101-0111 pattern in any orientation.

1, 1, 1, 1, 1, 17, 47, 213, 1235, 4969, 37883, 407179, 4619435, 65431997, 1207923913, 24951197669, 667166329171

Offset

1,6

Links

Table of n, a(n) for n=1..17.

Example

Maximal 8 X 8 example
.0.1.1.0.0.0.1.1
.0.1.0.0.0.0.0.1
.0.1.1.1.0.1.1.1
.0.0.1.0.0.0.1.0
.0.1.0.0.0.1.0.0
.1.1.1.0.1.1.1.0
.1.0.0.0.0.0.1.0
.1.1.0.0.0.1.1.0

Crossrefs

Sequence in context: A220081 A229448 A155841 * A083296 A362480 A159850

Adjacent sequences: A147055 A147056 A147057 * A147059 A147060 A147061

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved