

A018240


Rational knots with n crossings (up to mirroring).


5



1, 1, 2, 3, 7, 12, 24, 45, 91, 176, 352, 693, 1387, 2752
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OFFSET

3,3


COMMENTS

Identical through a(13) = 352 with Twobridge Knots of crossing number n, in Table 1: Number of knots having twobridged Conway polynomials, of Koseleff.


REFERENCES

E. Ernst and D. W. Sumners, "The growth of the number of prime knots", Math. Proc. Cambridge Philos. Soc. vol. 102 pages 303315.


LINKS

Table of n, a(n) for n=3..16.
P. V. Koseleff, D. Pecker, Conway polynomials of twobridge links, Nov 27, 2010.


CROSSREFS

There is a conjecture that this is the same as A090596.
Sequence in context: A000630 A036538 A108742 * A090596 A054272 A129016
Adjacent sequences: A018237 A018238 A018239 * A018241 A018242 A018243


KEYWORD

nice,nonn


AUTHOR

Alexander Stoimenow (stoimeno(AT)math.toronto.edu)


STATUS

approved



