n | a(n) |
---|---|
1 | 2 |
2 | 5 |
3 | 20 |
4 | 85 |
5 | 418 |
6 | 2242 |
7 | 12828 |
8 | 77777 |
9 | 493286 |
10 | 3260485 |
11 | 22314484 |
12 | 157735801 |
13 | 1147285362 |
14 | 8570960234 |
15 | 65611620808 |
16 | 513963377327 |
17 | 4113363020482 |
18 | 33598074760393 |
19 | 279764563749076 |
20 | 2372822051513583 |
21 | 20481425601917742 |
[2,5,20,85,418,2242,12828,77777,493286,3260485, 22314484,157735801,1147285362,8570960234, 65611620808,513963377327,4113363020482, 33598074760393,279764563749076,2372822051513583, 20481425601917742] |