n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 52 |
6 | 205 |
7 | 917 |
8 | 4658 |
9 | 26817 |
10 | 173899 |
11 | 1257916 |
12 | 10036409 |
13 | 87351977 |
14 | 821268402 |
15 | 8273013085 |
16 | 88696718215 |
17 | 1006586902196 |
18 | 12037812901733 |
19 | 151136735414301 |
20 | 1985815346287906 |
[1,1,2,5,15,52,205,917,4658,26817,173899,1257916, 10036409,87351977,821268402,8273013085, 88696718215,1006586902196,12037812901733, 151136735414301,1985815346287906] |