n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 2 |
4 | 6 |
5 | 30 |
6 | 180 |
7 | 1260 |
8 | 10080 |
9 | 90720 |
10 | 887040 |
11 | 9432360 |
12 | 107012160 |
13 | 1300448160 |
14 | 16716051384 |
15 | 228160919040 |
16 | 3276565988040 |
17 | 49664631128706 |
18 | 788840324793320 |
[1,0,2,6,30,180,1260,10080,90720,887040,9432360, 107012160,1300448160,16716051384,228160919040, 3276565988040,49664631128706,788840324793320] |