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%I #22 Sep 06 2021 11:43:46
%S 1,14,1041,127776
%N a(n) is the number of cyclic-classes of N^n MHV Yangian-invariant functions.
%C From Table 3, p. 93 of Arkani-Hamed.
%C 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
%H Nima Arkani-Hamed, Jacob L. Bourjaily, Freddy Cachazo, Alexander B. Goncharov, Alexander Postnikov and Jaroslav Trnka, <a href="https://arxiv.org/abs/1212.5605">Scattering Amplitudes and the Positive Grassmannian</a>, arXiv:1212.5605 [hep-th], 2012-2014.
%H Jorge Mago, Anders Schreiber, Marcus Spradlin and Anastasia Volovich, <a href="https://doi.org/10.1007/JHEP10(2019)099">Yangian Invariants and Cluster Adjacency in N=4 Yang-Mills</a>, J. High Energ. Phys. 2019, 99.
%H Natalie Wolchover, <a href="https://www.simonsfoundation.org/quanta/20130917-a-jewel-at-the-heart-of-quantum-physics/">"A Jewel at the Heart of Quantum Physics"</a>, Quanta Magazine, Sep 17, 2013
%K nonn,hard,more
%O 1,2
%A _Jonathan Vos Post_, Sep 18 2013
%E Name corrected by _Andrey Zabolotskiy_, Sep 06 2021