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A032333
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Shifts left under "CHJ" (necklace, identity, labeled) transform.
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0
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1, 1, 1, 4, 20, 160, 1240, 13560, 149900, 2011940, 28865620, 475287860, 8289874060, 161736893240, 3350194920540, 75447930411100, 1807230749404340, 46377810638160560, 1258317734014917940
(list; graph; refs; listen; history; internal format)
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