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REFERENCES
| M. Atiyah, On the unreasonable effectiveness of physics in mathematics, in "Highlights of Mathematical Physics:, ed. A. S. Fokas, pp. 25-.
D. A. Cox and S. Katz, Mirror Symmetry and Algebraic Geometry, American Mathematical Society, 1999, p. 198.
P. DiFranceso and C. Itzykson, Quantum intersection rings, in The Moduli Space of Curves, Birkhaeuser, Boston, 1995, pp. 81-148.
Sergey Fomin and Grigory Mikhalkin, Labeled floor diagrams for plane curves, arXiv:0906.3828. [From N. J. A. Sloane, Sep 27 2010]
W. Fulton, Enumerative geometry via quantum cohomology, lecture notes, AMS Summer Institute, Santa Cruz, 1995.
Daniel B. Grunberg and Pieter Moree, with an Appendix by Don Zagier, Sequences of enumerative geometry: congruences and asymptotics, arXiv math.NT/0610286.
M. Kontsevich, Enumeration of rational curves via torus actions, in The Moduli Space of Curves, Birkhaeuser, Boston, 1995, 335-368.
Yuri I. Manin, Frobenius Manifolds, Quantum Cohomology and Moduli Spaces, American Mathematical Society, 1999, p. 7.
Grigory Mikhalkin, Enumerative tropical algebraic geometry in R^2, arXiv:math/0312530v4. [From N. J. A. Sloane, Sep 27 2010]
Ian Strachan, How to count curves: from C. 19 problems to C. 20 solutions, Phil. Trans. Royal Soc. London, A 351 (2003), 2633-2647.
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MATHEMATICA
| a[n_] := a[n] = Sum[ a[k]*a[n-k]*k^2*(n-k)*(3k-n)*(3n-4)! / (3k-1)! / (3*(n-k)-2)!, {k, 1, n-1}]; a[1] = 1; Table[a[n], {n, 1, 13}] (* From Jean-François Alcover, Nov 09 2011, after Pari *)
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