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例子
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, ...
1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, ...
1, 7, 22, 46, 79, 121, 172, 232, 301, 379, 466, ...
1, 10, 46, 136, 307, 586, 1000, 1576, 2341, 3322, 4546, ...
1, 13, 79, 307, 886, 2086, 4258, 7834, 13327, 21331, 32521, ...
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