This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A352506 #15 Jun 06 2022 06:22:36 %S A352506 1,2,4,9,10,21 %N A352506 Number of complex Grothendieck rings of multiplicity one and rank n. %C A352506 A complex Grothendieck ring is a fusion ring admitting a categorification into a fusion category over the complex field. %C A352506 See the comments in A348305 for the definition of fusion ring, rank, multiplicity. %C A352506 A complex fusion category is a C-linear semisimple rigid tensor category with finitely many simple objects and finite dimensional spaces of morphisms, such that the neutral object is simple, see the book by Etingof-Gelaki-Nikshych-Ostrik mentioned below. %C A352506 This counting comes from the paper by Liu-Palcoux-Ren mentioned below. %H A352506 P. Etingof, S. Gelaki, D. Nikshych and V. Ostrik, <a href="http://www-math.mit.edu/~etingof/egnobookfinal.pdf">Tensor Categories</a>, Mathematical Surveys and Monographs Volume 205 (2015). %H A352506 Z. Liu, S. Palcoux and Y. Ren, <a href="https://doi.org/10.1007/s11005-022-01542-1">Classification of Grothendieck rings of complex fusion categories of multiplicity one up to rank six</a>, Lett Math Phys 112, 54 (2022); <a href="https://arxiv.org/abs/2010.10264">arXiv version</a>, arXiv:2010.10264 [math.CT], 2020-2021. %e A352506 For n=1, there is only the trivial one, so a(1)=1. %e A352506 For n=2, there are only the cyclic group C2 one and the Yang-Lee one, so a(2)=2. %Y A352506 Cf. A000001, A348305. %K A352506 nonn,hard,more %O A352506 1,2 %A A352506 _Sébastien Palcoux_, Mar 19 2022