begin = [1]
yield begin
begin = [1,1]
yield begin
while True:
    nextBegin = [1]
    for i in range(0,len(begin)-1,1):
        nextBegin.append(begin[i+1] + begin[i])
    nextBegin.append(1)
    yield nextBegin
    begin = []
    for i in range(0,len(nextBegin)):
        begin.append(nextBegin[i])