n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 3 |
4 | 56 |
5 | 330 |
6 | 5724 |
7 | 68460 |
8 | 1351552 |
9 | 24594192 |
10 | 578257200 |
11 | 13915923120 |
12 | 389216689344 |
13 | 11518744311360 |
14 | 377576873670528 |
15 | 13185760854520800 |
16 | 497969104450867200 |
17 | 19992393239486976000 |
18 | 856421361373185137664 |
19 | 38819358713756193292800 |
[1,0,2,3,56,330,5724,68460,1351552,24594192, 578257200,13915923120,389216689344,11518744311360, 377576873670528,13185760854520800, 497969104450867200,19992393239486976000, 856421361373185137664,38819358713756193292800] |