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 A007105 M5285 #29 Jul 08 2025 16:59:54
%S A007105 1,0,0,0,1,44,7570,1975560,749649145,399035751464,289021136349036,
%T A007105 277435664056527360,345023964977303838105,545099236551025860229460,
%U A007105 1075595203804151695555622446
%N A007105 Number of labeled Eulerian 3-regular digraphs with n nodes.
%C A007105 Apparently this counts the binary variant (all elements in {0,1}) of A001500 with zero trace. - _R. J. Mathar_, May 16 2021
%D A007105 R. W. Robinson, personal communication.
%D A007105 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A007105 Óscar González, Carlos Beltrán, and Ignacio Santamaría, <a href="http://arxiv.org/abs/1301.6196">On the Number of Interference Alignment Solutions for the K-User MIMO Channel with Constant Coefficients</a>, arXiv preprint arXiv:1301.6196 [cs.IT], 2013-2014. - From _N. J. A. Sloane_, Feb 19 2013
%H A007105 Jan Tóth and Ondřej Kuželka, <a href="https://arxiv.org/abs/2404.12905">Complexity of Weighted First-Order Model Counting in the Two-Variable Fragment with Counting Quantifiers: A Bound to Beat</a>, arXiv:2404.12905 [cs.LO], 2024. See p. 18.
%Y A007105 Cf. A001500, A284990.
%K A007105 nonn
%O A007105 0,6
%A A007105 _N. J. A. Sloane_