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A146789 Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 0100-1100-1111 pattern in any orientation. 0
1, 1, 1, 1, 1, 1, 9, 15, 43, 69, 163, 581, 2209, 8241, 41447, 165505, 1023967, 5358635, 39185391, 257135019, 2265291735 (list; graph; refs; listen; history; internal format)
OFFSET

1,7

EXAMPLE

Maximal 8 X 8 example

.1.0.0.0.1.1.1.1

.1.0.0.0.1.1.0.0

.1.1.1.0.0.1.0.0

.1.1.0.0.0.0.0.0

.0.0.0.0.0.0.1.1

.0.0.1.0.0.1.1.1

.0.0.1.1.0.0.0.1

.1.1.1.1.0.0.0.1

CROSSREFS

Sequence in context: A057478 A128687 A193579 * A194946 A020172 A020174

Adjacent sequences:  A146786 A146787 A146788 * A146790 A146791 A146792

KEYWORD

nonn

AUTHOR

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

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Last modified February 14 11:36 EST 2012. Contains 205623 sequences.