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A032084
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Doubles (index 2+) under "BHJ" (reversible, identity, labeled) transform.
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0
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2, 2, 24, 462, 11160, 341580, 12608400, 547343370, 27331736040, 1544172271740, 97398535948560, 6785134202537460, 517427034160916880, 42873386093615717640, 3835533156158013710400
(list; graph; refs; listen; history; internal format)
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