A146063 Number of n X n binary arrays with all ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation.

1, 1, 5, 17, 53, 497, 10289, 196357, 5677027, 310742317, 27512226687, 3369038880519, 646981592661815, 203366474520147193

Offset

1,3

Links

Table of n, a(n) for n=1..14.

Example

Maximal 8 X 8 example
.0.0.1.0.0.0.1.0
.1.1.1.0.1.1.1.0
.1.0.0.0.1.0.0.1
.0.0.0.0.0.1.1.1
.0.1.1.0.0.1.0.0
.0.1.0.1.1.0.0.1
.1.1.0.1.0.1.1.1
.0.0.1.1.0.1.0.0

Crossrefs

Sequence in context: A242429 A097160 A149656 * A146006 A161470 A295163

Adjacent sequences: A146060 A146061 A146062 * A146064 A146065 A146066

Keyword

nonn

Author

R. H. Hardin, Oct 26 2008

Status

approved