1, 2, 6, 15,40, 104, ()
A.329
B.273
C.225
D.185
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1, 2, 6, 15, 40, 104, () A.273 B.329 C.185 D.
1,2,6,15,40,104,()。A.233 B.256 C.273 D.296
1, 2, 6, 15,40, 104 ()A.273 B.329 C.185 D.225
1,2,6,15,40,104,()A.329B.273C.225D.185
1, 2, 6, 15,40, 104 () A.273 B.329 C.185 D.225