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A008982
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Number of immersions of the oriented circle into the unoriented plane with n double points.
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6
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1, 2, 5, 21, 102, 640, 4492, 34047, 272252, 2268085, 19502386, 172113886, 1551948268
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OFFSET
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0,2
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REFERENCES
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V. I. Arnold, Topological Invariants of Plane Curves and Caustics, American Math. Soc., 1994, p. 16.
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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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