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