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.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