n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 7 |
5 | 20 |
6 | 51 |
7 | 154 |
8 | 460 |
9 | 1476 |
10 | 4860 |
11 | 16544 |
12 | 57321 |
13 | 202059 |
14 | 720370 |
15 | 2593470 |
16 | 9408000 |
17 | 34350506 |
18 | 126108252 |
19 | 465200332 |
20 | 1723341185 |
21 | 6408356052 |
22 | 23911255544 |
23 | 89495909408 |
24 | 335916703284 |
25 | 1264114452975 |
26 | 4768464107355 |
[1,1,3,7,20,51,154,460,1476,4860,16544,57321, 202059,720370,2593470,9408000,34350506,126108252, 465200332,1723341185,6408356052,23911255544, 89495909408,335916703284,1264114452975, 4768464107355] |