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 | 27643409 |
14 | 190833091 |
15 | 1381223515 |
16 | 10448641031 |
17 | 82388624090 |
18 | 675565642030 |
19 | 5748668560311 |
20 | 50672729373781 |
21 | 461933478903121 |
22 | 4348527928700455 |
23 | 42216300909368230 |
24 | 422143264687282845 |
[1,1,2,5,15,52,203,877,4140,21147,115975,678570, 4213596,27643409,190833091,1381223515,10448641031, 82388624090,675565642030,5748668560311, 50672729373781,461933478903121,4348527928700455, 42216300909368230,422143264687282845] |