n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 18 |
6 | 54 |
7 | 216 |
8 | 864 |
9 | 3456 |
10 | 13824 |
11 | 55296 |
12 | 221184 |
13 | 884736 |
14 | 3538944 |
15 | 14155776 |
16 | 56623104 |
17 | 226492416 |
18 | 905969664 |
19 | 4529848320 |
20 | 22649241600 |
21 | 113246208000 |
22 | 566231040000 |
23 | 2831155200000 |
24 | 14155776000000 |
25 | 70778880000000 |
[1,1,2,6,18,54,216,864,3456,13824,55296,221184, 884736,3538944,14155776,56623104,226492416, 905969664,4529848320,22649241600,113246208000, 566231040000,2831155200000,14155776000000, 70778880000000] |