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 A234268 #7 Aug 02 2016 12:02:41 %S A234268 1,4,21,129,876,6376,48829,388771,3191849,26864936 %N A234268 Number of convex topologies on an n-point totally ordered set. %H A234268 Tyler Clark and Tom Richmond, <a href="http://people.wku.edu/tom.richmond/Papers/CountConvexTopsFTOsets.pdf">The Number of Convex Topologies on a Finite Totally Ordered Set</a>, 2013, Involve, Vol. 8 (2015), No. 1, 25-32. %Y A234268 Cf. A000798, A007052. %K A234268 nonn,more %O A234268 1,2 %A A234268 _N. J. A. Sloane_, Dec 24 2013