n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 52 |
6 | 203 |
7 | 877 |
8 | 4140 |
9 | 21147 |
10 | 115975 |
11 | 678570 |
12 | 4213596 |
13 | 27643917 |
14 | 190873448 |
15 | 1382311874 |
16 | 10468191626 |
17 | 82676728870 |
18 | 679376431959 |
19 | 5796059673820 |
20 | 51241781683988 |
21 | 468639956185787 |
22 | 4426928995172738 |
23 | 43131913020157751 |
24 | 432877526792148982 |
[1,1,2,5,15,52,203,877,4140,21147,115975,678570, 4213596,27643917,190873448,1382311874,10468191626, 82676728870,679376431959,5796059673820, 51241781683988,468639956185787,4426928995172738, 43131913020157751,432877526792148982] |