n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 3 |
4 | 12 |
5 | 38 |
6 | 124 |
7 | 430 |
8 | 1530 |
9 | 5378 |
10 | 18938 |
11 | 67042 |
12 | 238446 |
13 | 849586 |
14 | 3033214 |
15 | 10851386 |
16 | 38895414 |
17 | 139634834 |
18 | 502003486 |
19 | 1807104810 |
20 | 6512929766 |
21 | 23498319154 |
22 | 84864219966 |
23 | 306764487338 |
24 | 1109807490550 |
25 | 4018136484386 |
26 | 14558333191406 |
[1,1,3,12,38,124,430,1530,5378,18938,67042,238446, 849586,3033214,10851386,38895414,139634834, 502003486,1807104810,6512929766,23498319154, 84864219966,306764487338,1109807490550, 4018136484386,14558333191406] |