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 A273183 #5 May 19 2016 04:13:23
%S A273183 1,59,59,1
%N A273183 The H_3-Eulerian numbers.
%C A273183 a(n) is the number of elements of the Weyl group H_3 that have a descent set of size n.
%C A273183 Sum_{n=0..3} a(n) = 120, which is the order of the group H_3.
%D A273183 T. K. Petersen, Eulerian Numbers, Birkhauser, 2015, Table 11.5.
%Y A273183 Cf. A008292, A060187, A066094, A273000, A273035, A273036, A273181.
%K A273183 nonn,fini,full
%O A273183 0,2
%A A273183 _Tom Edgar_, May 17 2016