| 数据
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1, 1, 4, 12, 42, 153, 595, 2343, 9542, 39413, 166281, 708897, 3061940, 13353865, 58750955, 260487890, 1162823080, 5222031742, 23582500740, 107010241453, 487788886128, 2232519065432, 10255861643899, 47276532426065, 218615273009775, 1013881795097680, 4714877471655987, 21980833198519547
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