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 A005966 M1511 #17 Jun 02 2025 16:32:24
%S A005966 1,2,5,17,71,357,2143,14960,116560,986983,8874072
%N A005966 Number of trivalent planar loopless multigraphs with 2n nodes.
%D A005966 A. T. Balaban, Enumeration of Cyclic Graphs, pp. 63-105 of A. T. Balaban, ed., Chemical Applications of Graph Theory, Ac. Press, 1976; see p. 92.
%D A005966 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%o A005966 (nauty) for n in {1..10}; do geng -cqD3 $[2*$n] | planarg -q | multig -ur3; done # _Sean A. Irvine_, Oct 25 2016
%Y A005966 Cf. A000421 (allowing non-planar), A005957 (allowing loops).
%K A005966 nonn,more
%O A005966 1,2
%A A005966 _N. J. A. Sloane_
%E A005966 a(7)-a(11) and title improved by _Sean A. Irvine_, Oct 25 2016