A147211 - OEIS

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A147211

Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0111-0011 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 17, 17, 57, 57, 405, 405, 4805, 4805, 131407, 131407, 3796773, 3796773, 159419173, 159419173

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

OFFSET

1,9

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Maximal 9 X 9 example

.0.0.0.0.0.0.0.0.0

.1.1.0.0.0.0.0.1.1

.1.1.1.0.0.0.1.1.1

.0.0.1.1.0.1.1.0.0

.0.0.0.0.0.0.0.0.0

.0.0.1.1.0.1.1.0.0

.1.1.1.0.0.0.1.1.1

.1.1.0.0.0.0.0.1.1

.0.0.0.0.0.0.0.0.0

CROSSREFS

Sequence in context: A146439 A146785 A146572 * A147241 A146580 A146455

Adjacent sequences: A147208 A147209 A147210 * A147212 A147213 A147214

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved