A147269 Number of n X n binary arrays with all ones connected only in a 1000-1000-1111-0001 pattern in any orientation.

1, 1, 1, 9, 33, 105, 641, 6905, 201549, 4387885, 127114651, 5630544435

Offset

1,4

Links

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

Example

Maximal 8 X 8 example
.1.0.0.0.1.1.1.0
.1.1.1.1.0.0.1.0
.0.0.0.1.0.0.1.0
.0.0.0.1.0.0.1.1
.1.0.0.0.1.1.0.0
.1.0.0.0.0.1.0.0
.1.1.1.1.0.1.0.0
.0.0.0.1.0.1.1.1

Crossrefs

Sequence in context: A231765 A220165 A036543 * A147123 A147107 A147115

Adjacent sequences: A147266 A147267 A147268 * A147270 A147271 A147272

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved