A147200 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0100-0111-0001 pattern in any orientation.

1, 1, 1, 1, 1, 5, 13, 45, 141, 593, 2479, 13149, 73679, 588757, 5000629, 56709831, 657094563

Offset

1,6

Links

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

Example

Maximal 8 X 8 example
.0.0.1.1.0.0.1.1
.0.0.1.0.0.0.1.0
.1.1.1.0.1.1.1.0
.1.0.0.0.1.0.0.0
.0.0.0.1.0.0.0.1
.0.1.1.1.0.1.1.1
.0.1.0.0.0.1.0.0
.1.1.0.0.1.1.0.0

Crossrefs

Sequence in context: A006349 A322203 A052899 * A147396 A320877 A099972

Adjacent sequences: A147197 A147198 A147199 * A147201 A147202 A147203

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved