n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 1 |
6 | 11 |
7 | 21 |
8 | 167 |
9 | 616 |
10 | 2308 |
11 | 7792 |
12 | 42090 |
13 | 164290 |
14 | 733278 |
15 | 2785855 |
16 | 13613231 |
17 | 54109235 |
18 | 230492863 |
19 | 899895753 |
20 | 3997708404 |
21 | 16033421220 |
[1,1,1,2,1,11,21,167,616,2308,7792,42090,164290, 733278,2785855,13613231,54109235,230492863, 899895753,3997708404,16033421220] |