1,2,6,16,44,()
A.66
B.84
C.88
D.120
1,2,6,16,44,()A.66 B.84 C.88 D.120
:1,2,6,16,44,()() A.66B.84C.88D.120
1,2,6,16,44,() A.66 B.84 C.88 D.120
1,2,6,16,44,()() A.66B.84C.88D.120
1,2,6,16,44,()() A.66 B.84 C.88 D.120
1,2,6,16,44,() A.100B.120C.140D.160