n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 15 |
6 | 46 |
7 | 137 |
8 | 460 |
9 | 1557 |
10 | 5698 |
11 | 21269 |
12 | 83948 |
13 | 339177 |
14 | 1430502 |
15 | 6178981 |
16 | 27636512 |
17 | 126500209 |
18 | 596320914 |
19 | 2873324677 |
20 | 14203422044 |
21 | 71669915585 |
22 | 369941778510 |
23 | 1946679921381 |
[0,0,1,2,6,15,46,137,460,1557,5698,21269,83948, 339177,1430502,6178981,27636512,126500209, 596320914,2873324677,14203422044,71669915585, 369941778510,1946679921381] |