a=1 l1=[1] while True: yield l1 l2=[1] a1,a2=0,1 while a2<a: l2.append(l1[a1]+l1[a2]) a1=a1+1 a2=a2+1 l2.append(1) l1=l2 a=a+1
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a=1 l1=[1] while True: yield l1 l2=[1] a1,a2=0,1 while a2<a: l2.append(l1[a1]+l1[a2]) a1=a1+1 a2=a2+1 l2.append(1) l1=l2 a=a+1