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A146648
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-1000 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 7, 13, 45, 61, 187, 447, 2017, 5419, 35435, 111161, 866245, 3379807, 30738337, 147143823, 1633304661
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.1.1.0
.1.0.1.0.0.1.0.0
.1.1.1.1.0.1.1.0
.1.0.0.0.0.1.0.0
.0.0.1.0.0.0.0.1
.0.1.1.0.1.1.1.1
.0.0.1.0.0.1.0.1
.0.1.1.1.0.0.0.0
CROSSREFS
Sequence in context: A023286 A287685 A159305 * A374727 A219501 A267310
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 04 2008
STATUS
approved