n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 23 |
5 | 107 |
6 | 585 |
7 | 3669 |
8 | 25932 |
9 | 203768 |
10 | 1761109 |
11 | 16595757 |
12 | 169287873 |
13 | 1857903529 |
14 | 21823488238 |
15 | 273130320026 |
16 | 3627845694283 |
17 | 50962676849199 |
18 | 754814462534449 |
19 | 11754778469338581 |
20 | 191998054346198680 |
[1,1,2,6,23,107,585,3669,25932,203768,1761109, 16595757,169287873,1857903529,21823488238, 273130320026,3627845694283,50962676849199, 754814462534449,11754778469338581, 191998054346198680] |