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 A091577 #7 Jan 30 2018 18:57:37 %S A091577 6,10,14,18,20,20,20,18,14,10,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, %T A091577 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, %U A091577 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 %N A091577 Poincaré series [or Poincare series] of the preprojective algebra of a Dynkin diagram of type E_6. %C A091577 The series is a polynomial because the algebra is finite dimensional. See the entry for A091575 for a general formula. %D A091577 I. Reiten, Dynkin diagrams and the representation theory of algebras, Notices of the AMS, Vol. 44, Number 5. %Y A091577 Cf. A091571, A091572, A091573, A091574, A091575, A091576. %K A091577 easy,nonn %O A091577 0,1 %A A091577 _Paul Boddington_, Jan 22 2004