n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 54 |
6 | 235 |
7 | 1237 |
8 | 7790 |
9 | 57581 |
10 | 489231 |
11 | 4690254 |
12 | 49986715 |
13 | 585372877 |
14 | 7463687750 |
15 | 102854072045 |
16 | 1522671988215 |
17 | 24093282856182 |
18 | 405692082526075 |
19 | 7242076686885157 |
20 | 136599856992122366 |
21 | 2714409550073698925 |
[1,1,2,5,15,54,235,1237,7790,57581,489231,4690254, 49986715,585372877,7463687750,102854072045, 1522671988215,24093282856182,405692082526075, 7242076686885157,136599856992122366, 2714409550073698925] |