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A032321
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Number of aperiodic necklaces with n labeled beads of 2 colors.
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0
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2, 2, 12, 72, 720, 6480, 90720, 1209600, 20321280, 359251200, 7424524800, 160465536000, 3923023104000, 101213996083200, 2853345470976000, 85364982743040000, 2742350070620160000, 93039294691639296000
(list; graph; refs; listen; history; internal format)
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