n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 10 |
4 | 86 |
5 | 756 |
6 | 7092 |
7 | 71856 |
8 | 787824 |
9 | 9329760 |
10 | 118956960 |
11 | 1627067520 |
12 | 23786386560 |
13 | 370371536640 |
14 | 6122231942400 |
15 | 107109431654400 |
16 | 1977781262284800 |
17 | 38445562145894400 |
18 | 784885857270681600 |
19 | 16792523049093120000 |
20 | 375755553108633600000 |
21 | 8777531590107033600000 |
[0,1,10,86,756,7092,71856,787824,9329760, 118956960,1627067520,23786386560,370371536640, 6122231942400,107109431654400,1977781262284800, 38445562145894400,784885857270681600, 16792523049093120000,375755553108633600000, 8777531590107033600000] |