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 | 27644383 |
14 | 190897649 |
15 | 1382919174 |
16 | 10479355676 |
17 | 82850735298 |
18 | 681840170501 |
19 | 5828967784989 |
20 | 51665915664913 |
21 | 473990899143781 |
22 | 4493642492511044 |
23 | 43959218211619150 |
[1,1,2,5,15,52,203,877,4140,21147,115975,678570, 4213596,27644383,190897649,1382919174,10479355676, 82850735298,681840170501,5828967784989, 51665915664913,473990899143781,4493642492511044, 43959218211619150] |