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%I #31 Nov 02 2021 02:31:10
%S 1,4,20,133,1013,9209,89889,929373,9880120,107087360,1174950951,
%T 13008800489,145024885270,1625819872988,18311555574347,
%U 207068032188985,2349706730746994,26745505016101977,305267158873891108,3492857897924201864
%N Number of 4-regular maps with n vertices on the torus, up to orientation-preserving and orientation-reversing isomorphisms.
%H E. Krasko and A. Omelchenko, <a href="https://arxiv.org/abs/1709.03230">Enumeration of r-regular Maps on the Torus. Part II: Enumeration of Unsensed Maps</a>, arXiv preprint arXiv:1709.03230 [math.CO], 2017. See Table 1, p. 20.
%H E. Krasko and A. Omelchenko, <a href="https://doi.org/10.1016/j.disc.2018.09.004">Enumeration of r-regular maps on the torus. Part II: Unsensed maps</a>, Discrete Mathematics, Volume 342, Issue 2, February 2019, pp. 600-614.
%Y Cf. A292971 (enumerates up to orientation-preserving isomorphisms only), A292405, A292408.
%K nonn
%O 1,2
%A _Evgeniy Krasko_, Sep 17 2017
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