A147032 - OEIS

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A147032

Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 3, 13, 13, 31, 31, 77, 77, 387, 387

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

OFFSET

1,13

LINKS

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

EXAMPLE

Maximal 13 X 13 example

.0.0.0.0.1.0.0.0.1.0.0.0.0

.0.0.1.1.1.0.0.0.1.1.1.0.0

.0.1.0.0.1.1.0.1.1.0.0.1.0

.0.1.0.0.1.0.0.0.1.0.0.1.0

.1.1.1.1.0.0.0.0.0.1.1.1.1

.0.0.1.0.0.0.0.0.0.0.1.0.0

.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.0.1.0.0.0.0.0.0.0.1.0.0

.1.1.1.1.0.0.0.0.0.1.1.1.1

.0.1.0.0.1.0.0.0.1.0.0.1.0

.0.1.0.0.1.1.0.1.1.0.0.1.0

.0.0.1.1.1.0.0.0.1.1.1.0.0

.0.0.0.0.1.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A135949 A168234 A141245 * A146261 A146176 A147136

Adjacent sequences: A147029 A147030 A147031 * A147033 A147034 A147035

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved