S(3)=17:
['3', '22', '211', '1121', '11112', '111111', '11111', '1112', '1111', '121', '112', '111', '21', '12', '11', '2', '1']
S(4) 大于3^20,前几项:
['4', '33', '322', '3211', '31121', '311112', '3111111', '22311111', '222231112', '2222231111', '22222223121', '222222223112', '2222222223111']
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