an+1 |
an |
an+1 |
an |
an |
an-1 |
an |
(n+2)! |
1 |
2 |
x |
k |
b |
k |
an+1 |
an |
an+1 |
an |
an |
an-1 |
1 |
k |
1 |
k |
an+1 |
an |
an |
an-1 |
an-1 |
an-2 |
a2 |
a1 |
an |
(n+2)! |
n! |
(n+2)! |
1 |
(n+2)(n+1) |
1 |
n+1 |
1 |
n+2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
n+1 |
1 |
n+2 |
1 |
2 |
1 |
n+2 |
1 |
2 |
| ||
个n |
| ||
n个 |
1 |
an+an+1 |
1 |
a1a2 |
1 |
a2a3 |
1 |
a2008a2009 |
1 |
2 |
. |
| . |
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