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Search: id:A008988
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| A008988 |
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Number of immersions of oriented circle into unoriented sphere with n double points. |
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+0
1
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OFFSET
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0,3
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REFERENCES
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V. I. Arnold, Topological Invariants of Plane Curves..., American Math. Soc., 1994, p. 18.
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CROSSREFS
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Adjacent sequences: A008985 A008986 A008987 this_sequence A008989 A008990 A008991
Sequence in context: A115089 A001928 A005638 this_sequence A061232 A020091 A008987
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KEYWORD
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nonn,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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Two more terms from Guy H. Valette (guy.valette(AT)skynet.be), Feb 09 2004
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