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A147351 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01010-11111-00100 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 1, 3, 13, 21, 43, 69, 199, 467, 1790, 4987 (list; graph; refs; listen; history; internal format)
OFFSET

1,8

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.1.0.1.0

.1.1.0.1.1.1.1.1

.0.1.1.0.0.1.0.0

.1.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.1

.0.0.1.0.0.1.1.0

.1.1.1.1.1.0.1.1

.0.1.0.1.0.0.1.0

CROSSREFS

Sequence in context: A055059 A050903 A117766 * A147097 A147105 A057589

Adjacent sequences:  A147348 A147349 A147350 * A147352 A147353 A147354

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net)

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Last modified February 16 04:47 EST 2012. Contains 205860 sequences.