n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 14 |
5 | 54 |
6 | 233 |
7 | 1101 |
8 | 5625 |
9 | 30846 |
10 | 180474 |
11 | 1120666 |
12 | 7352471 |
13 | 50772653 |
14 | 367819093 |
15 | 2787354668 |
16 | 22039186530 |
17 | 181408823710 |
18 | 1551307538185 |
19 | 13756835638385 |
20 | 126298933271289 |
21 | 1198630386463990 |
22 | 11742905240821910 |
[1,1,4,14,54,233,1101,5625,30846,180474,1120666, 7352471,50772653,367819093,2787354668,22039186530, 181408823710,1551307538185,13756835638385, 126298933271289,1198630386463990, 11742905240821910] |