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A067646 Number of prime alternating tangles (or knots) with two connected components. 2
1, 2, 4, 8, 24, 72, 264, 1074, 4490, 20296, 92768, 439148, 2118654, 10377708, 51740280, 260545092, 1328891356, 6836872181 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
S. R. Finch, Knots, links and tangles, Aug 08 2003. [Cached copy, with permission of the author]
CROSSREFS
Equals A067644 + 2*A067645.
Sequence in context: A115115 A026097 A264557 * A152875 A179190 A291482
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 05 2002
EXTENSIONS
More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 21 2003
STATUS
approved

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Last modified March 28 11:44 EDT 2024. Contains 371241 sequences. (Running on oeis4.)