n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 5 |
5 | 15 |
6 | 54 |
7 | 212 |
8 | 908 |
9 | 4011 |
10 | 18260 |
11 | 84320 |
12 | 394462 |
13 | 1860872 |
14 | 8843896 |
15 | 42275308 |
16 | 203113670 |
17 | 980101070 |
18 | 4747504560 |
19 | 23074132601 |
[1,1,2,5,15,54,212,908,4011,18260,84320,394462, 1860872,8843896,42275308,203113670,980101070, 4747504560,23074132601] |