n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 30 |
6 | 101 |
7 | 370 |
8 | 1459 |
9 | 6161 |
10 | 27741 |
11 | 132621 |
12 | 670444 |
13 | 3571013 |
14 | 19975956 |
15 | 117026702 |
16 | 716199026 |
17 | 4568532550 |
18 | 30313253547 |
19 | 208834580360 |
20 | 1491280419431 |
21 | 11021454603693 |
22 | 84184429969735 |
23 | 663707628683503 |
[1,2,4,10,30,101,370,1459,6161,27741,132621, 670444,3571013,19975956,117026702,716199026, 4568532550,30313253547,208834580360,1491280419431, 11021454603693,84184429969735,663707628683503] |