n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 21 |
5 | 80 |
6 | 322 |
7 | 1347 |
8 | 5798 |
9 | 25512 |
10 | 114236 |
11 | 518848 |
12 | 2384538 |
13 | 11068567 |
14 | 51817118 |
15 | 244370806 |
16 | 1159883685 |
17 | 5536508864 |
18 | 26560581688 |
19 | 127993221140 |
20 | 619280193640 |
21 | 3007251366000 |
22 | 14651743202152 |
23 | 71601107803904 |
24 | 350873710447210 |
25 | 1723795243004223 |
[1,1,2,6,21,80,322,1347,5798,25512,114236,518848, 2384538,11068567,51817118,244370806,1159883685, 5536508864,26560581688,127993221140,619280193640, 3007251366000,14651743202152,71601107803904, 350873710447210,1723795243004223] |