A227205 a(n) is the number of cyclic-classes of N^n MHV Yangian-invariant functions.

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

Table of n, a(n) for n=1..4.

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

Adjacent sequences: A227202 A227203 A227204 * A227206 A227207 A227208

Keyword

nonn,hard,more

Author

Jonathan Vos Post, Sep 18 2013

Extensions

Name corrected by Andrey Zabolotskiy, Sep 06 2021

Status

approved