n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 2 |
3 | 4 |
4 | 16 |
5 | 88 |
6 | 600 |
7 | 4800 |
8 | 43680 |
9 | 443296 |
10 | 4949920 |
11 | 60217408 |
12 | 792134528 |
13 | 11200176128 |
14 | 169375195136 |
15 | 2728019576832 |
16 | 46626359376384 |
17 | 842947307334144 |
18 | 16073131554826752 |
19 | 322403473258650624 |
20 | 6786861273524305920 |
[1,2,2,4,16,88,600,4800,43680,443296,4949920, 60217408,792134528,11200176128,169375195136, 2728019576832,46626359376384,842947307334144, 16073131554826752,322403473258650624, 6786861273524305920] |