n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 8 |
4 | 20 |
5 | 40 |
6 | 384 |
7 | 10240 |
8 | 126720 |
9 | 1013760 |
10 | 48660480 |
11 | 7612661760 |
12 | 473174507520 |
13 | 16701626253312 |
14 | 4036421002199040 |
15 | 407426244909465600 |
16 | 23814785343474892800 |
17 | 932976775107465707520 |
18 | 26694111965427724713984 |
19 | 9044593230639040844267520 |
[1,2,8,20,40,384,10240,126720,1013760,48660480, 7612661760,473174507520,16701626253312, 4036421002199040,407426244909465600, 23814785343474892800,932976775107465707520, 26694111965427724713984,9044593230639040844267520] |