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 A007169 M1865 #19 Jul 08 2025 17:02:21
%S A007169 0,1,2,8,43,283,1946,14010,103292,776784,5931402,45870248,358501321,
%T A007169 2827227425,22469524972,179785568562,1447059691048,11708296894260,
%U A007169 95176461591230,776935668014674,6366225809581766,52344041948585714
%N A007169 Number of Q-graphs rooted at a polygon.
%D A007169 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A007169 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 A007169 G.f. Sum_{r >= 2} Z(C_{2*r}; B(x)) where Z(C_{2*r}) is the cycle index of the cyclic group C_{2*r} and B(x) is the g.f. for A003168. - _Sean A. Irvine_, Nov 07 2017
%Y A007169 Cf. A003168.
%K A007169 nonn
%O A007169 1,3
%A A007169 _N. J. A. Sloane_
%E A007169 a(9) corrected and more terms from _Sean A. Irvine_, Nov 07 2017