n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 9 |
4 | 28 |
5 | 205 |
6 | 726 |
7 | 8659 |
8 | 47384 |
9 | 562545 |
10 | 4234330 |
11 | 68588311 |
12 | 483088332 |
13 | 10699776685 |
14 | 102434734598 |
15 | 2016289908585 |
16 | 24588487650736 |
17 | 611171244308689 |
18 | 6456997293606738 |
19 | 209020565553571999 |
20 | 2838875160624256460 |
[1,2,9,28,205,726,8659,47384,562545,4234330, 68588311,483088332,10699776685,102434734598, 2016289908585,24588487650736,611171244308689, 6456997293606738,209020565553571999, 2838875160624256460] |