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 A007991 #8 Jan 30 2018 18:57:34 %S A007991 1,2,7,18,42,88,176,324,581,984,1631,2594,4055,6140,9164 %N A007991 Poincaré series [or Poincare series] of Lie algebra associated with a certain braid group. %D A007991 S. P. Humphries, Braid groups, infinite Lie algebras of Cartan type and rings of invariants, Topology and its Applications, 95 (3) (1999) pp. 173-205. %H A007991 S. P. Humphries, <a href="http://www.math.byu.edu/~steve/">Home page</a> %K A007991 nonn %O A007991 2,2 %A A007991 _Stephen P. Humphries_