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 A018193 #18 Feb 04 2019 16:58:00 %S A018193 1,1,3,11,69,602,6531,84737,1271143,21623667,411133711,8639077230, %T A018193 198801435313,4972210166209,134299831740091,3895950849227855, %U A018193 120808412263797173,3987662458459383826,139598735205063044939 %N A018193 Number of chord diagrams of degree n with an isolated chord of length 1. %H A018193 D. Bar-Natan, <a href="http://www.math.toronto.edu/drorbn/papers/OnVassiliev/index.html">On the Vassiliev Knot Invariants</a>, Topology 34 (1995) 423-472. %H A018193 D. Bar-Natan, <a href="http://www.pdmi.ras.ru/~duzhin/VasBib/">Bibliography of Vassiliev Invariants</a> %H A018193 Alexander Stoimenow, <a href="http://dx.doi.org/10.1016/S0012-365X(99)00347-7">On the number of chord diagrams</a>, Discr. Math. 218 (2000), 209-233. %t A018193 Stoimenow states that a Mma package is available from his website. - _N. J. A. Sloane_, Jul 26 2018 %K A018193 nonn %O A018193 1,3 %A A018193 Alexander Stoimenow (stoimeno(AT)math.toronto.edu) %E A018193 More terms from _Sean A. Irvine_, Feb 04 2019