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 A293956 #14 Oct 09 2021 16:02:27 %S A293956 0,0,2,4,6,9,11,14,18,20 %N A293956 Maximum over all sets of n points in the plane of the number of second-smallest distances between the points. %H A293956 Peter Brass, <a href="https://doi.org/10.1007/BF02187849">The maximum number of second smallest distances in finite planar sets</a>, Discrete & Computational Geometry 7.1 (1992): 371-379. %H A293956 Peter Brass, <a href="/A293956/a293956.png">Annotated version of Fig. 1 from Brass (1992)</a>, illustrating small values of a(n). %Y A293956 Cf. A047932, A186705. %K A293956 nonn,more %O A293956 1,3 %A A293956 _N. J. A. Sloane_, Nov 01 2017