00306nam a2200121Ia 4500082001900000100001800019245003100037260003100068300001500099490006000114500000500174700000500179  a511.6bR585.CI  aRiordan, John  aCombinatorial identitiesb  aNew YorkbJohn Wileyc1968  axii, 256p.  aWiley series in Probability and Mathematical Statistics  a  a