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Search: id:A146443
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A146443 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0100-0111 pattern in any orientation. +0
1
1, 1, 1, 1, 1, 1, 1, 17, 41, 75, 189, 781, 2423, 8297, 41313, 246219, 1447691, 8722011, 58593249, 472152107, 3875447631 (list; graph; listen)
OFFSET

1,8

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.0.0.1.1

.1.1.1.0.0.0.1.0

.0.0.1.0.1.1.1.0

.0.0.1.0.0.0.0.0

.0.0.0.0.0.1.0.0

.0.1.1.1.0.1.0.0

.0.1.0.0.0.1.1.1

.1.1.0.0.0.0.0.1

CROSSREFS

Sequence in context: A138005 A166147 A028886 this_sequence A110226 A054819 A087877

Adjacent sequences: A146440 A146441 A146442 this_sequence A146444 A146445 A146446

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net)

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.


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