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A146411
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1111-0100 pattern in any orientation.
0
1, 1, 1, 1, 1, 1, 7, 21, 45, 89, 233, 863, 3251, 15437, 73625, 393971, 2328247, 15894743, 120359659, 1040197243, 9831811849, 105976019467
OFFSET
1,7
EXAMPLE
Maximal 8 X 8 example
.0.0.0.0.0.1.1.0
.1.0.0.0.1.1.0.0
.1.1.1.1.0.1.0.0
.0.1.0.0.0.1.0.0
.0.0.1.0.0.0.1.0
.0.0.1.0.1.1.1.1
.0.0.1.1.0.0.0.1
.0.1.1.0.0.0.0.0
CROSSREFS
Sequence in context: A246430 A256051 A299254 * A287431 A127736 A212677
KEYWORD
nonn
AUTHOR
STATUS
approved