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A227205
a(n) is the number of cyclic-classes of N^n MHV Yangian-invariant functions.
0
1, 14, 1041, 127776
OFFSET
1,2
COMMENTS
From Table 3, p. 93 of Arkani-Hamed.
According to Mago et al., Table 3 of Arkani-Hamed et al. has typos, which invalidates their values a(3) = 1041 and a(4) = 127776. - Andrey Zabolotskiy, Sep 06 2021
LINKS
Nima Arkani-Hamed, Jacob L. Bourjaily, Freddy Cachazo, Alexander B. Goncharov, Alexander Postnikov and Jaroslav Trnka, Scattering Amplitudes and the Positive Grassmannian, arXiv:1212.5605 [hep-th], 2012-2014.
Jorge Mago, Anders Schreiber, Marcus Spradlin and Anastasia Volovich, Yangian Invariants and Cluster Adjacency in N=4 Yang-Mills, J. High Energ. Phys. 2019, 99.
Natalie Wolchover, "A Jewel at the Heart of Quantum Physics", Quanta Magazine, Sep 17, 2013
CROSSREFS
Sequence in context: A349737 A263217 A208388 * A297766 A160011 A104226
KEYWORD
nonn,hard,more
AUTHOR
Jonathan Vos Post, Sep 18 2013
EXTENSIONS
Name corrected by Andrey Zabolotskiy, Sep 06 2021
STATUS
approved