%N Poincaré series [or Poincare series] of the preprojective algebra of a Dynkin diagram of type E_7.
%C The series is a polynomial because the algebra is finite dimensional. See the entry for A091575 for a general formula.
%Y Cf. A091571, A091572, A091573, A091574, A091575, A091577.
%A _Paul Boddington_, Jan 22 2004