A146006 Number of n X n binary arrays with all ones connected only in a 3X3 tee 1,1 1,2 1,3 2,2 3,2 in any orientation.

1, 1, 5, 17, 53, 559, 10558, 208889, 6272332, 353563401, 30617473617, 3806002157431, 753576262868027

Offset

1,3

Links

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

Example

Maximal 8 X 8 example
.1.0.0.1.1.1.0.0
.1.1.1.0.1.0.0.0
.1.0.0.0.1.0.0.1
.0.0.0.0.0.1.1.1
.0.0.1.1.1.0.0.1
.0.1.0.1.0.1.0.0
.0.1.0.1.0.1.1.1
.1.1.1.0.0.1.0.0

Crossrefs

Sequence in context: A097160 A149656 A146063 * A389266 A161470 A295163

Adjacent sequences: A146003 A146004 A146005 * A146007 A146008 A146009

Keyword

nonn

Author

R. H. Hardin, Oct 26 2008

Status

approved