A147261 Number of n X n binary arrays with all ones connected only in a 0100-1100-0111-0001 pattern in any orientation.

1, 1, 1, 9, 33, 105, 825, 13503, 390699, 9339771, 391769047, 28305812373, 3390227207577

Offset

1,4

Links

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

Example

Maximal 8 X 8 example
.0.0.1.1.0.1.0.0
.0.0.1.0.1.1.1.0
.1.1.1.0.0.0.1.0
.0.1.0.0.0.0.1.1
.1.0.0.0.0.1.0.0
.1.1.1.0.1.1.0.0
.0.0.1.1.0.1.1.1
.0.0.1.0.0.0.0.1

Crossrefs

Sequence in context: A147123 A147107 A147115 * A197359 A147155 A146232

Adjacent sequences: A147258 A147259 A147260 * A147262 A147263 A147264

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved