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 A273184 #5 May 18 2016 11:58:49
%S A273184 1,2636,9126,2636,1
%N A273184 The H_4-Eulerian numbers.
%C A273184 a(n) is the number of elements of the Weyl group H_4 that have a descent set of size n.
%C A273184 Sum_{n=0..4} a(n) = 14400, which is the order of the group H_4.
%D A273184 T. K. Petersen, Eulerian Numbers, Birkhauser, 2015, Table 11.5.
%Y A273184 Cf. A008292, A060187, A066094, A273000, A273035, A273036, A273181, A273183.
%K A273184 nonn,fini,full
%O A273184 0,2
%A A273184 _Tom Edgar_, May 17 2016