n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 12 |
5 | 120 |
6 | 1140 |
7 | 10815 |
8 | 104496 |
9 | 1037484 |
10 | 10627560 |
11 | 112508550 |
12 | 1231481460 |
13 | 13933510734 |
14 | 162864103584 |
15 | 1965078765195 |
16 | 24453461392080 |
17 | 313549334233440 |
18 | 4138796594051568 |
19 | 56188737057169593 |
20 | 783876449182595400 |
[0,0,0,1,12,120,1140,10815,104496,1037484, 10627560,112508550,1231481460,13933510734, 162864103584,1965078765195,24453461392080, 313549334233440,4138796594051568, 56188737057169593,783876449182595400] |