n | a(n) |
---|---|
1 | 2 |
2 | 2 |
3 | 3 |
4 | 9 |
5 | 32 |
6 | 125 |
7 | 489 |
8 | 1971 |
9 | 8057 |
10 | 33582 |
11 | 141854 |
12 | 606967 |
13 | 2623678 |
14 | 11444588 |
15 | 50306835 |
16 | 222638649 |
17 | 991173730 |
18 | 4435974275 |
19 | 19946529375 |
20 | 90069370028 |
21 | 408261634445 |
22 | 1856940442884 |
23 | 8472695323318 |
[2,2,3,9,32,125,489,1971,8057,33582,141854,606967, 2623678,11444588,50306835,222638649,991173730, 4435974275,19946529375,90069370028,408261634445, 1856940442884,8472695323318] |