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 A007170 M1877 #20 Jul 08 2025 17:02:26 %S A007170 0,1,2,8,48,328,2335,17133,128262,975547,7518282,58582564,460769228, %T A007170 3653385453,29170737927,234350263419,1892956305974,15364355580327, %U A007170 125247311808502,1024983176867450,8417817643684208,69355110426227296 %N A007170 Number of Q-graphs with 2n edges. %D A007170 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A007170 R. C. Read, <a href="http://dx.doi.org/10.1007/BF02188172">On the enumeration of a class of plane multigraphs</a>, Aequat. Math. 31 (1986) no 1, 47-63. %F A007170 a(n) = A007169(n) + (A294724(n) - A294728(n)) / 2. - _Sean A. Irvine_, Nov 07 2017 %Y A007170 Cf. A007169, A294724, A294728. %K A007170 nonn %O A007170 1,3 %A A007170 _N. J. A. Sloane_ %E A007170 a(9) corrected and more terms from _Sean A. Irvine_, Nov 07 2017