n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 13 |
4 | 68 |
5 | 420 |
6 | 3015 |
7 | 24541 |
8 | 223884 |
9 | 2263381 |
10 | 25121075 |
11 | 303716281 |
12 | 3973432728 |
13 | 55931774473 |
14 | 842950049823 |
15 | 13543132571641 |
16 | 231076203767720 |
17 | 4172914800390601 |
[0,1,3,13,68,420,3015,24541,223884,2263381, 25121075,303716281,3973432728,55931774473, 842950049823,13543132571641,231076203767720, 4172914800390601] |