A171118 Three-dimensional Welschinger invariants.

1, -1, 45, -14589, 17756793, -58445425017, 426876362998821, -6061743911446054965, 152244625648721441783409

Offset

0,3

Links

Table of n, a(n) for n=0..8.

Aubin Arroyo, Erwan Brugallé and Lucía López de Medrano, Recursive formulas for Welschinger invariants of the projective plane, International Mathematics Research Notices, 2011, 1107-1134; arXiv:0809.1541 [math.AG], 2008-2010. See numbers W3(d) in Section 7.3.

Erwan Brugallé and Penka Georgieva, Pencils of quadrics and Gromov-Witten-Welschinger invariants of CP^3, Mathematische Annalen 365, 363-380 (2016); arXiv:1508.02560 [math.AG], 2015-2016.

Erwan Brugallé and Grigory Mikhalkin, Enumeration of curves via floor diagrams, C. R. Acad. Sci. Paris, Ser. I, 345 (2007), 329-334; arXiv:0706.0083 [math.AG], 2007.

Crossrefs

Cf. A319851.

Sequence in context: A184136 A101994 A201004 * A199521 A007537 A287434

Adjacent sequences: A171115 A171116 A171117 * A171119 A171120 A171121

Keyword

sign,more

Author

N. J. A. Sloane, Sep 27 2010

Extensions

a(4)-a(6) from Arroyo et al. added by Andrey Zabolotskiy, May 03 2022

a(7)-a(8) from Brugallé & Georgieva added by Andrey Zabolotskiy, Aug 27 2022

Status

approved