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Search: id:A147366
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A147366 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 01110-11111 pattern in any orientation. +0
1
1, 1, 1, 1, 1, 1, 4, 7, 18, 27, 60, 127, 520, 1313, 5577, 14738, 65753, 214371, 1292619, 5259696, 36901354, 169889413, 1338225681, 7299428688 (list; graph; listen)
OFFSET

1,7

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.1.1.1.0

.1.1.0.1.1.1.1.1

.1.1.0.0.0.0.0.0

.1.1.0.0.0.0.1.0

.0.1.0.0.0.0.1.1

.0.0.0.0.0.0.1.1

.1.1.1.1.1.0.1.1

.0.1.1.1.0.0.1.0

CROSSREFS

Sequence in context: A077274 A080650 A005509 this_sequence A056318 A011948 A146387

Adjacent sequences: A147363 A147364 A147365 this_sequence A147367 A147368 A147369

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net)

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.


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