| 数据
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1, 1, 4, 12, 52, 200, 906, 3835, 17835, 79215, 374381, 1710234, 8170299, 38011835, 182943410, 862048941, 4171224246, 19838535950, 96382566615, 461629848142, 2249821353330, 10834620431069, 52936934322254, 256041710688572, 1253562592466569, 6084551109301534, 29840382820005767, 145261082306545356
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