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 A273035 #6 May 14 2016 13:46:17
%S A273035 1,17635,309969,1123915,1123915,309969,17635,1
%N A273035 The E_7-Eulerian numbers.
%C A273035 a(n) is the number of elements of the Weyl group E_7 that have a descent set of size n.
%C A273035 Sum_{n=0..7} a(n) = 2903040, which is the order of the group E_7.
%D A273035 T. K. Petersen, Eulerian Numbers, Birkhauser, 2015, Table 11.5.
%Y A273035 Cf. A008292, A060187, A066094, A273000.
%K A273035 nonn,fini,full
%O A273035 0,2
%A A273035 _Tom Edgar_, May 13 2016