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A146432
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 101-111-101 pattern in any orientation.
0
1, 1, 1, 1, 1, 3, 7, 13, 27, 99, 409, 1589, 6601, 37581, 257850, 1891375, 15191004, 148990011, 1749816180, 23213477355, 345838116504, 6040299518273, 124363503908437, 2949204267636321, 79815904035468955, 2501797176290873519
OFFSET
1,6
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.1.0.1.0
.0.0.0.0.1.1.1.0
.0.0.0.0.1.0.1.0
.0.0.0.0.0.0.0.0
.1.1.1.0.0.0.0.0
.0.1.0.0.0.0.0.0
.1.1.1.0.0.0.0.0
.0.0.0.0.0.0.0.0
CROSSREFS
Sequence in context: A098479 A119445 A146904 * A258349 A089726 A093575
KEYWORD
nonn
AUTHOR
STATUS
approved