n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 3 |
4 | 56 |
5 | 270 |
6 | 5064 |
7 | 47040 |
8 | 984416 |
9 | 14116032 |
10 | 336538080 |
11 | 6589416240 |
12 | 179336461248 |
13 | 4446985514400 |
14 | 137520942168960 |
15 | 4112410749501600 |
16 | 143445512622458880 |
17 | 5004065722611594240 |
18 | 195260931334478223360 |
19 | 7762385328551718796800 |
20 | 336051947630616458065920 |
[1,0,2,3,56,270,5064,47040,984416,14116032, 336538080,6589416240,179336461248,4446985514400, 137520942168960,4112410749501600, 143445512622458880,5004065722611594240, 195260931334478223360,7762385328551718796800, 336051947630616458065920] |