n | a(n) |
---|---|
1 | 2 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 10 |
6 | 25 |
7 | 70 |
8 | 200 |
9 | 600 |
10 | 1845 |
11 | 5830 |
12 | 18772 |
13 | 61542 |
14 | 204659 |
15 | 689410 |
16 | 2347920 |
17 | 8074762 |
18 | 28009524 |
19 | 97909318 |
20 | 344615860 |
21 | 1220539390 |
22 | 4347310451 |
23 | 15564141262 |
24 | 55985418344 |
25 | 202256970300 |
26 | 733607281875 |
27 | 2670698800548 |
28 | 9755982857964 |
29 | 35751803209918 |
30 | 131405090455065 |
31 | 484316704740126 |
32 | 1789672012052256 |
[2,1,2,4,10,25,70,200,600,1845,5830,18772,61542, 204659,689410,2347920,8074762,28009524,97909318, 344615860,1220539390,4347310451,15564141262, 55985418344,202256970300,733607281875, 2670698800548,9755982857964,35751803209918, 131405090455065,484316704740126,1789672012052256] |