A147131 Number of n X n binary arrays with all ones connected only in a 1000-1001-1111 pattern in any orientation.

1, 1, 1, 17, 57, 277, 2295, 39117, 1059135, 28274373, 1087879177, 69075461955

Offset

1,4

Links

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

Example

Maximal 8 X 8 example
.1.1.1.1.0.0.0.0
.1.0.0.1.0.1.1.1
.1.0.0.0.0.0.0.1
.0.0.0.0.0.0.0.1
.1.1.0.0.0.0.1.1
.1.0.0.0.1.0.0.0
.1.0.0.0.1.0.0.1
.1.1.1.0.1.1.1.1

Crossrefs

Sequence in context: A141841 A146682 A146650 * A147162 A146690 A146437

Adjacent sequences: A147128 A147129 A147130 * A147132 A147133 A147134

Keyword

nonn

Author

R. H. Hardin, Nov 04 2008

Status

approved