n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 7 |
6 | 28 |
7 | 131 |
8 | 720 |
9 | 4513 |
10 | 31824 |
11 | 249513 |
12 | 2151744 |
13 | 20242983 |
14 | 206313024 |
15 | 2264425179 |
16 | 26628836352 |
17 | 334022337153 |
18 | 4451717814528 |
19 | 62820790592913 |
20 | 935750983412736 |
21 | 14672143677452679 |
22 | 241555066200437760 |
[1,1,1,2,7,28,131,720,4513,31824,249513,2151744, 20242983,206313024,2264425179,26628836352, 334022337153,4451717814528,62820790592913, 935750983412736,14672143677452679, 241555066200437760] |