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A052418
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Number of n-crossing knots having symmetry group D4.
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0
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0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 11, 18, 21, 31, 53, 89
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OFFSET
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1,7
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REFERENCES
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Hoste, J.; Thistlethwaite, M.; and Weeks, J. "The First 1,701,936 Knots." Math. Intell., 20, 33-48, Fall 1998.
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LINKS
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Table of n, a(n) for n=1..16.
Eric Weisstein's World of Mathematics, Knot Symmetry.
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CROSSREFS
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Cf. A052415, ..., A052426.
Sequence in context: A104420 A188532 A181288 * A051800 A121432 A118968
Adjacent sequences: A052415 A052416 A052417 * A052419 A052420 A052421
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KEYWORD
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nonn,hard
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AUTHOR
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Eric W. Weisstein
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STATUS
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approved
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