%N Number of rational curves on S of degree d passing through d-1 general points, where S is a general cubic surface in projective 3-space.
%C Finding a recursive formula (à la Kontsevich for A013587?) remains open.
%C The famous 27 lines on a cubic surface is the case a(1) = 27. - _Michael Somos_, Feb 25 2014
%H Steven R. Finch, <a href="/A013587/a013587.pdf">Enumerative geometry</a>, February 24, 2014. [Cached copy, with permission of the author]
%H W. Traves, <a href="http://www.usna.edu/Users/math/traves/presentations/MAAC2004print.pdf">Conics on the cubic surface</a>, MAAC 2004, George Mason University.
%Y Cf. A013587, A027363.
%A _Steven Finch_, Feb 25 2014