A147209 Number of n X n binary arrays with all ones connected only in a 1100-0111-0011 pattern in any orientation.

1, 1, 1, 17, 57, 405, 4805, 131407, 3796773, 159419173, 11442459321, 1404806567709

Offset

1,4

Links

Table of n, a(n) for n=1..12.

Example

Maximal 8 X 8 example
.0.0.1.1.0.1.1.0
.1.1.1.0.0.1.1.0
.1.1.0.0.0.0.1.1
.0.0.1.0.1.1.0.1
.0.1.1.0.1.1.0.0
.1.1.0.1.1.0.1.1
.1.1.0.1.0.1.1.1
.0.0.0.0.1.1.0.0

Crossrefs

Sequence in context: A146437 A146783 A146570 * A147239 A264473 A146578

Adjacent sequences: A147206 A147207 A147208 * A147210 A147211 A147212

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved