n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 8 |
4 | 22 |
5 | 124 |
6 | 948 |
7 | 6138 |
8 | 50832 |
9 | 468144 |
10 | 5165280 |
11 | 54704880 |
12 | 695854080 |
13 | 9016051680 |
14 | 130427750880 |
15 | 1994479744320 |
16 | 32575206343680 |
17 | 555499414471680 |
18 | 10284817657927680 |
19 | 196642556903116800 |
20 | 3994718386866278400 |
21 | 84989047758544742400 |
22 | 1895851170953432985600 |
[1,1,8,22,124,948,6138,50832,468144,5165280, 54704880,695854080,9016051680,130427750880, 1994479744320,32575206343680,555499414471680, 10284817657927680,196642556903116800, 3994718386866278400,84989047758544742400, 1895851170953432985600] |