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A121021 Number of crossing-optimal drawings of the complete graph K_n. 1
0, 0, 0, 0, 0, 1, 1, 5, 3, 3080, 5679 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,8

COMMENTS

a(11) is at least 10^6

REFERENCES

Shengjun Pan and R. Bruce Richter, in "The Crossing Number of K_11 is 100", submitted.

LINKS

Table of n, a(n) for n=0..10.

EXAMPLE

a(5)=1 because all drawings of K_5 with only 1 crossing are isomorphic.

CROSSREFS

Cf. A000241.

Sequence in context: A100653 A105318 A304287 * A237518 A274649 A258234

Adjacent sequences:  A121018 A121019 A121020 * A121022 A121023 A121024

KEYWORD

nonn

AUTHOR

David Applegate, Sep 08 2006

STATUS

approved

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Last modified October 18 07:42 EDT 2019. Contains 328146 sequences. (Running on oeis4.)