n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 8 |
3 | 54 |
4 | 384 |
5 | 3000 |
6 | 25920 |
7 | 246960 |
8 | 2580480 |
9 | 29393280 |
10 | 362880000 |
11 | 4829932800 |
12 | 68976230400 |
13 | 1052366515200 |
14 | 17086945075200 |
15 | 294226732800000 |
16 | 5356234211328000 |
17 | 102793666719744000 |
18 | 2074369080655872000 |
19 | 43913881247588352000 |
20 | 973160803270656000000 |
21 | 22531105497723863040000 |
[0,1,8,54,384,3000,25920,246960,2580480,29393280, 362880000,4829932800,68976230400,1052366515200, 17086945075200,294226732800000,5356234211328000, 102793666719744000,2074369080655872000, 43913881247588352000,973160803270656000000, 22531105497723863040000] |