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 A273181 #5 May 19 2016 04:13:08
%S A273181 1,236,678,236,1
%N A273181 The F_4-Eulerian numbers.
%C A273181 a(n) is the number of elements of the Weyl group F_4 that have a descent set of size n.
%C A273181 Sum_{n=0..4} a(n) = 1152, which is the order of the group F_4.
%D A273181 T. K. Petersen, Eulerian Numbers, Birkhauser, 2015, Table 11.5.
%Y A273181 Cf. A008292, A060187, A066094, A273000, A273035, A273036.
%K A273181 nonn,fini,full
%O A273181 0,2
%A A273181 _Tom Edgar_, May 17 2016