n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 6 |
4 | 24 |
5 | 0 |
6 | 720 |
7 | 10080 |
8 | 40320 |
9 | 362880 |
10 | 10886400 |
11 | 119750400 |
12 | 958003200 |
13 | 24908083200 |
14 | 523069747200 |
15 | 6538371840000 |
16 | 125536739328000 |
17 | 3556874280960000 |
18 | 70426110763008000 |
19 | 1338096104497152000 |
[1,0,0,6,24,0,720,10080,40320,362880,10886400, 119750400,958003200,24908083200,523069747200, 6538371840000,125536739328000,3556874280960000, 70426110763008000,1338096104497152000] |