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A193624
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Number of ways n triples can sit in a row without any siblings next to each other.
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4
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1, 0, 72, 37584, 53529984, 152458744320, 766958183193600, 6236531290739312640, 76788695692068062330880, 1361934174627779827740180480, 33454092372947487842682293452800, 1102556254139040688616563751190528000
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