an+1 |
an |
a1 |
2! |
a2 |
3! |
an |
(n+1)! |
1 |
a |
a2 |
a1 |
1 |
a |
an+1 |
an |
an+1 |
an |
an |
an-1 |
an-1 |
an-2 |
a2 |
a1 |
an |
a1 |
0! |
2! |
1! |
3! |
(n-1)! |
(n+1)! |
1 |
2×1 |
1 |
3×2 |
1 |
(n+1)n |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
n |
1 |
n+1 |
1 |
n+1 |
n |
n+1 |
1 |
2 |
1 |
3 |
1 |
4 |
1 |
2n-1 |
1 |
2n |
1 |
n+1 |
1 |
n+2 |
1 |
n+3 |
1 |
2n |
1 |
f(n) |
1 |
3 |
11 |
12 |
1 |
an2 |
1 |
n(n+1) |
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