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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;
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refs;
listen;
history;
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internal format)
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OFFSET
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1,1
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LINKS
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FORMULA
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"CHJ" (necklace, identity, labeled) transform of 2, 0, 0, 0...
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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