n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 1 |
5 | 7 |
6 | 16 |
7 | 45 |
8 | 628 |
9 | 1612 |
10 | 14387 |
11 | 52539 |
12 | 275568 |
13 | 1397560 |
14 | 5222290 |
15 | 30835346 |
16 | 108322293 |
17 | 606465366 |
18 | 2386082882 |
[1,1,2,1,7,16,45,628,1612,14387,52539,275568, 1397560,5222290,30835346,108322293,606465366, 2386082882] |