| 数据
|
1, 1, 3, 7, 19, 60, 185, 571, 1857, 6100, 20193, 68372, 233154, 795296, 2743437, 9550939, 33338093, 116943668, 412645815, 1460122884, 5181607406, 18468520608, 66016250037, 236455799708, 849337831838, 3058593825728, 11033836131750, 39881355285040, 144452154327412, 524058450659536, 1904071884603245
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