n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 20 |
6 | 80 |
7 | 384 |
8 | 2016 |
9 | 12096 |
10 | 82080 |
11 | 597888 |
12 | 4783104 |
13 | 41886720 |
14 | 389145600 |
15 | 3891456000 |
16 | 41803776000 |
17 | 472283136000 |
18 | 5667397632000 |
19 | 72153317376000 |
20 | 959814696960000 |
21 | 13437405757440000 |
22 | 197840194965504000 |
23 | 3028176742219776000 |
24 | 48450827875516416000 |
[1,1,1,2,6,20,80,384,2016,12096,82080,597888, 4783104,41886720,389145600,3891456000,41803776000, 472283136000,5667397632000,72153317376000, 959814696960000,13437405757440000, 197840194965504000,3028176742219776000, 48450827875516416000] |