n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 18 |
5 | 86 |
6 | 500 |
7 | 3423 |
8 | 26889 |
9 | 238158 |
10 | 2347554 |
11 | 25487721 |
12 | 302211543 |
13 | 3885576979 |
14 | 53842995268 |
15 | 799953072549 |
16 | 12684970150411 |
17 | 213832353964067 |
18 | 3818434892215474 |
19 | 72004772253206073 |
20 | 1429809049027949160 |
[1,1,2,5,18,86,500,3423,26889,238158,2347554, 25487721,302211543,3885576979,53842995268, 799953072549,12684970150411,213832353964067, 3818434892215474,72004772253206073, 1429809049027949160] |