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A110887 Number of configurations of n skew lines up to isotopy. 0
1, 1, 2, 3, 7, 19, 74 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

A. Borobia and V. F. Mazurovskii, On diagrams of configurations of 7 skew lines in R^3, Amer. Math. Soc. Transl. (2) 173 (1996), 33-40

A. Borobia and V. F. Mazurovskii, Nonsingular configurations of 7 lines in RP^3, J. Knot Theory Ramif. 6(6) (1997), 751-783

O. Y. Viro and Y. V. Drobotukhina, Configurations of skew lines, Leningrad Math. J. 1(4) (1990), 1027-1050

LINKS

Table of n, a(n) for n=1..7.

CROSSREFS

Sequence in context: A060276 A025563 A224929 * A065060 A164625 A079804

Adjacent sequences:  A110884 A110885 A110886 * A110888 A110889 A110890

KEYWORD

hard,more,nonn

AUTHOR

David Garber (garber(AT)hait.ac.il), Sep 20 2005

STATUS

approved

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Last modified October 21 21:20 EDT 2014. Contains 248377 sequences.