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LINKS
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Table of n, a(n) for n=3..9.
Aubin Arroyo, Erwan Brugalle, Lucia Lopez de Medrano, Recursive formulas for Welschinger invariants of the projective plane, arXiv:0809.1541 [math.AG], 2008-2010. See W2(k,0) numbers in 7.3 Some computations pp. 17-18.
Antoine Chambert-Loir, Quand la géométrie devient tropicale, Pour la Science, No 492, October 2018 (in French).
I. Itenberg, V. Kharlamov, E. Shustin, Welschinger invariant and enumeration of real plane rational curves, arXiv:math/0303378 [math.AG], 2003.
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