A147170 Number of n X n binary arrays with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.

1, 1, 1, 9, 33, 81, 501, 9129, 252307, 4894765, 134053463, 8030367567, 812329207639

Offset

1,4

Links

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

Example

Maximal 8 X 8 example
.0.1.0.0.1.1.0.0
.0.1.1.1.0.1.0.0
.0.1.0.0.0.1.1.1
.1.1.0.0.0.1.0.0
.0.0.1.0.0.0.0.1
.0.0.1.0.1.1.1.1
.1.1.1.1.0.1.0.0
.1.0.0.0.0.1.0.0

Crossrefs

Sequence in context: A227221 A273316 A101990 * A146823 A147027 A146256

Adjacent sequences: A147167 A147168 A147169 * A147171 A147172 A147173

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved