運算式 3: "E" left parenthesis, 0 , right parenthesis equals 0E0=0
3
運算式 4: "E" left parenthesis, "n" , right parenthesis equals StartFraction, 1 plus Start sum from "k" equals 1 to "n" , end sum, "B" left parenthesis, "n" , "k" , right parenthesis times "E" left parenthesis, "n" minus "k" , right parenthesis Over 1 minus "B" left parenthesis, "n" , 0 , right parenthesis , EndFractionEn=1+n∑k=1Bn,k·En−k1−Bn,0
