an |
an+1 |
2n |
an |
an |
an+1 |
1 |
an+1 |
an+1 |
an |
1 |
an |
1 |
an+1 |
1 |
an |
1 |
a1 |
1 |
a2 |
1 |
a1 |
1 |
a3 |
1 |
a2 |
1 |
an |
1 |
an-1 |
1 |
an |
1 |
n |
2n |
an |
2×(1-2n) |
1-2 |
A.12 | B.16 | C.32 | D.54 |
a2k+1 |
a2k-1 |
a2k+2 |
a2k |
|
a2k |
a2k-1 |
|
A.1个 | B.2个 | C.3个 | D.4个 |
1 |
2 |
an-1 |
anan+1 |
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