2 |
a |
6 |
a |
12 |
a |
20 |
a |
42 |
a |
n(n+1) |
a |
42 |
a |
n(n+1) |
a |
1 |
4 |
3 |
7 |
5 |
12 |
7 |
19 |
1 |
1×3 |
1 |
2 |
1 |
3 |
1 |
3×5 |
1 |
2 |
1 |
3 |
1 |
5 |
1 |
5×7 |
1 |
2 |
1 |
5 |
1 |
7 |
1 |
7×9 |
1 |
2 |
1 |
7 |
1 |
9 |
1 |
2 |
1 |
2 |
25 |
4 |
25 |
4 |
1 |
2 |
-1 |
2 |
1 |
3 |
-1 |
2 |
(-1)2 |
3 |
(-1)3 |
4 |
1 |
4 |
-1 |
2 |
(-1)2 |
3 |
(-1)3 |
4 |
(-1)4 |
5 |
(-1)5 |
6 |
1 |
n+1 |
-1 |
2 |
(-1)2 |
3 |
(-1)3 |
4 |
(-1)2n-1 |
2n |
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