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Search: id:A146591
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A146591 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0110-1111-0100 pattern in any orientation. +0
1
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 25, 25, 67, 67, 353, 353, 1577, 1577, 17635 (list; graph; listen)
OFFSET

1,13

EXAMPLE

Maximal 13 X 13 example

.0.0.0.0.1.0.0.0.1.0.0.0.0

.0.0.0.0.1.1.0.1.1.0.0.0.0

.0.0.0.1.1.1.0.1.1.1.0.0.0

.0.0.1.0.1.0.0.0.1.0.1.0.0

.1.1.1.1.0.0.0.0.0.1.1.1.1

.0.1.1.0.0.0.0.0.0.0.1.1.0

.0.0.0.0.0.0.0.0.0.0.0.0.0

.0.1.1.0.0.0.0.0.0.0.1.1.0

.1.1.1.1.0.0.0.0.0.1.1.1.1

.0.0.1.0.1.0.0.0.1.0.1.0.0

.0.0.0.1.1.1.0.1.1.1.0.0.0

.0.0.0.0.1.1.0.1.1.0.0.0.0

.0.0.0.0.1.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A144424 A147340 A147499 this_sequence A146868 A147430 A147462

Adjacent sequences: A146588 A146589 A146590 this_sequence A146592 A146593 A146594

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net), Nov 04 2008

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.


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