n | a(n) |
---|---|
1 | 2 |
2 | 4 |
3 | 12 |
4 | 35 |
5 | 155 |
6 | 239 |
7 | 779 |
8 | 2855 |
9 | 5279 |
10 | 9095 |
11 | 15695 |
12 | 59135 |
13 | 350699 |
14 | 183395 |
15 | 1352339 |
16 | 1477295 |
17 | 1077959 |
18 | 6922920 |
19 | 3038555 |
20 | 12705840 |
21 | 14199120 |
[2,4,12,35,155,239,779,2855,5279,9095,15695,59135, 350699,183395,1352339,1477295,1077959,6922920, 3038555,12705840,14199120] |