A147113 - OEIS

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A147113

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1000-1111-0010 pattern in any orientation.

1, 1, 1, 1, 1, 1, 1, 5, 23, 49, 83, 217, 723, 2201, 7571, 32315, 154081, 841887, 4456709, 26183699, 165757037

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

OFFSET

1,8

LINKS

Table of n, a(n) for n=1..21.

EXAMPLE

Maximal 8 X 8 example

.0.0.1.0.1.1.1.0

.1.1.1.1.0.0.1.0

.1.0.0.0.0.0.1.1

.1.0.0.0.0.0.1.0

.0.1.0.0.0.0.0.1

.1.1.0.0.0.0.0.1

.0.1.0.0.1.1.1.1

.0.1.1.1.0.1.0.0

CROSSREFS

Sequence in context: A057622 A055626 A127200 * A135771 A327409 A140811

Adjacent sequences: A147110 A147111 A147112 * A147114 A147115 A147116

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 04 2008

STATUS

approved