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 A091576 #7 Jan 30 2018 18:57:36 %S A091576 7,12,17,22,27,30,33,34,35,34,33,30,27,22,17,12,7,0,0,0,0,0,0,0,0,0,0, %T A091576 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 A091576 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 %N A091576 Poincaré series [or Poincare series] of the preprojective algebra of a Dynkin diagram of type E_7. %C A091576 The series is a polynomial because the algebra is finite dimensional. See the entry for A091575 for a general formula. %Y A091576 Cf. A091571, A091572, A091573, A091574, A091575, A091577. %K A091576 easy,nonn %O A091576 0,1 %A A091576 _Paul Boddington_, Jan 22 2004