n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 7 |
3 | 21 |
4 | 78 |
5 | 260 |
6 | 988 |
7 | 3458 |
8 | 13300 |
9 | 47880 |
10 | 185535 |
11 | 680295 |
12 | 2649570 |
13 | 9841260 |
14 | 38470380 |
15 | 144263925 |
16 | 565514586 |
17 | 2136388436 |
18 | 8392954570 |
19 | 31893227366 |
20 | 125515281892 |
21 | 479240167224 |
22 | 1888770070824 |
23 | 7240285271492 |
24 | 28569774314536 |
25 | 109883747363600 |
26 | 434040802086220 |
[1,2,7,21,78,260,988,3458,13300,47880,185535, 680295,2649570,9841260,38470380,144263925, 565514586,2136388436,8392954570,31893227366, 125515281892,479240167224,1888770070824, 7240285271492,28569774314536,109883747363600, 434040802086220] |