bn |
2n |
an |
an+2 |
bn |
2n |
bn-1 |
2n-1 |
1 |
2 |
bn |
2n |
bn-1 |
2n-1 |
1 |
2 |
bn |
2n |
1 |
2 |
1 |
2 |
bn |
2n |
1 |
2 |
1 |
2 |
n |
2 |
n |
2 |
an |
an+2 |
n! |
(n+2)! |
1 |
(n+1)(n+2) |
1 |
n+1 |
1 |
n+2 |
n |
2 |
a1 |
a3 |
a2 |
a4 |
a3 |
a5 |
an |
an+2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
5 |
1 |
n+1 |
1 |
n+2 |
1 |
2 |
1 |
n+2 |
1-2n |
1-2 |
1 |
2 |
1 |
n+2 |
1 |
2 |
1 |
n+2 |
6 | x |
1 | ||
2
|
A.341 | B.
| C.1023 | D.1024 |
1 |
an |
1 |
an-1 |
1 |
3 |
1 |
S1 |
1 |
S2 |
1 |
Sn |
1 |
3 |
3 |
4 |
A.12 | B.16 | C.20 | D.24 |
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