A146006 - OEIS

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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

(list; graph; refs; listen; history; text; internal format)

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 * A161470 A295163 A195689

Adjacent sequences: A146003 A146004 A146005 * A146007 A146008 A146009

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved