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A147434
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-0101 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 1, 5, 17, 31, 51, 113, 291, 823, 2647, 8411, 31311, 121645, 537901, 2460285, 12092291, 63560047, 371846157, 2296989649
OFFSET
1,8
EXAMPLE
Maximal 8 X 8 example
.1.0.1.0.0.0.1.1
.1.1.1.1.0.1.1.0
.0.1.0.1.0.0.1.1
.0.0.0.0.0.1.1.0
.0.1.1.0.0.0.0.0
.1.1.0.0.1.0.1.0
.0.1.1.0.1.1.1.1
.1.1.0.0.0.1.0.1
CROSSREFS
Sequence in context: A143798 A031013 A031370 * A147336 A128354 A078654
KEYWORD
nonn
AUTHOR
STATUS
approved