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A032336
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Doubles (index 2+) under "CHJ" (necklace, identity, labeled) transform.
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0
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2, 2, 24, 366, 7980, 212880, 6974520, 267915690, 11862673620, 594440826420, 33270303029040, 2057075448923880, 139254109289895600, 10243988810221846680, 813714967541542706640
(list; graph; refs; listen; history; internal format)
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