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A054993
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Number of "long curves", i.e., topological types of smooth embeddings of the oriented real line into the oriented plane that coincide with the standard immersion x -> (x,0) in the neighborhood of -infinity and +infinity.
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10
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1, 2, 8, 42, 260, 1796, 13396, 105706, 870772, 7420836, 65004584, 582521748, 5320936416, 49402687392, 465189744448, 4434492302426, 42731740126228, 415736458808868, 4079436831493480, 40338413922226212, 401652846850965808, 4024556509468827432, 40558226664529024000, 410887438338905738908, 4182776248940752113344, 42770152711524569532616, 439143340987014152920384, 4526179842103708969039296
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OFFSET
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0,2
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COMMENTS
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Also the number of knot diagrams with n crossings and two outgoing strings.
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REFERENCES
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V. I. Arnold, Topological Invariants of Plane Curves and Caustics, American Math. Soc., 1994.
S. M. Gusein-Zade, Adv. Sov. Math., v. 21 (1994), pp. 189-198.
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LINKS
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P. Zinn-Justin and J.-B. Zuber. Knot theory and matrix integrals. In The Oxford Handbook of Random Matrix Theory. 2011. Eds Akemann, Baik and Di Francesco. arXiv.
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CROSSREFS
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KEYWORD
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nonn,nice
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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