Comment by walrus

If you're still having trouble accessing it, here are direct links to the mirrors:

http://www.math.upenn.edu/~wilf/AeqB.pdf

http://www.math.rutgers.edu/~zeilberg/AeqB.pdf

http://www.fmf.uni-lj.si/aeqb/AeqB.pdf

The license agreement is (copied and pasted from the download page):

  Copyright 1996 by A K Peters, Ltd.

  Reproduction of the downloaded version is permitted for any valid
  educational purpose of an institution of learning, in which case only
  the reasonable costs of reproduction may be charged. Reproduction for
  profit or for any commercial purposes is strictly prohibited.