%I #3 Jun 23 2015 11:20:38
%S 1,1,2,3,7,19,74
%N Number of configurations of n skew lines up to isotopy.
%D 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
%D A. Borobia and V. F. Mazurovskii, Nonsingular configurations of 7 lines in RP^3, J. Knot Theory Ramif. 6(6) (1997), 751-783
%D O. Y. Viro and Y. V. Drobotukhina, Configurations of skew lines, Leningrad Math. J. 1(4) (1990), 1027-1050
%K hard,more,nonn
%O 1,3
%A _David Garber_, Sep 20 2005
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