| 数据
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1, 1, 2, 4, 9, 21, 56, 148, 421, 1207, 3535, 10407, 31879, 97111, 304344, 958636, 3045621, 9696563, 31478459, 101764723, 334038583, 1100234409, 3639933291, 12057585459, 40418753669, 135042191401, 455549125751, 1540601216083, 5223311667307, 17725604119599, 60646085848546, 206928271796266, 710805289086933
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