n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 12 |
6 | 63 |
7 | 393 |
8 | 2863 |
9 | 23715 |
10 | 220205 |
11 | 2264966 |
12 | 25561752 |
13 | 314044379 |
14 | 4172303890 |
15 | 59604341273 |
16 | 911094930877 |
17 | 14837831731420 |
18 | 256482519928832 |
19 | 4689966078698629 |
20 | 90449345803473559 |
21 | 1834829586299035049 |
[1,1,1,1,3,12,63,393,2863,23715,220205,2264966, 25561752,314044379,4172303890,59604341273, 911094930877,14837831731420,256482519928832, 4689966078698629,90449345803473559, 1834829586299035049] |