n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 24 |
5 | 180 |
6 | 1260 |
7 | 9450 |
8 | 77952 |
9 | 709128 |
10 | 7087440 |
11 | 77398200 |
12 | 918257472 |
13 | 11771602128 |
14 | 162251002368 |
15 | 2393704535040 |
16 | 37647052591104 |
17 | 628913396701440 |
18 | 11123162442408960 |
19 | 207662678687208960 |
[0,0,0,0,24,180,1260,9450,77952,709128,7087440, 77398200,918257472,11771602128,162251002368, 2393704535040,37647052591104,628913396701440, 11123162442408960,207662678687208960] |