n | a(n) |
---|---|
1 | 2 |
2 | 5 |
3 | 20 |
4 | 107 |
5 | 870 |
6 | 9436 |
7 | 122840 |
8 | 1863359 |
9 | 32019826 |
10 | 613981447 |
11 | 12989756316 |
12 | 300559406027 |
13 | 7550660328494 |
14 | 204687564072918 |
15 | 5955893472990664 |
16 | 185158932576089787 |
17 | 6125200100394894738 |
18 | 214837724735760642773 |
[2,5,20,107,870,9436,122840,1863359,32019826, 613981447,12989756316,300559406027,7550660328494, 204687564072918,5955893472990664, 185158932576089787,6125200100394894738, 214837724735760642773] |