n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 1 |
4 | 120 |
5 | 1 |
6 | 1512 |
7 | 1 |
8 | 17280 |
9 | 1 |
10 | 190080 |
11 | 1 |
12 | 1415232000 |
13 | 1 |
14 | 21772800 |
15 | 1 |
16 | 829108224000 |
17 | 1 |
18 | 105082151731200 |
19 | 1 |
20 | 4345502515200000 |
21 | 1 |
22 | 19989311569920000 |
23 | 1 |
24 | 626378114550988800000 |
25 | 1 |
26 | 17896517558599680000 |
27 | 1 |
28 | 944578196742891110400000 |
[1,2,6,1,120,1,1512,1,17280,1,190080,1,1415232000, 1,21772800,1,829108224000,1,105082151731200,1, 4345502515200000,1,19989311569920000,1, 626378114550988800000,1,17896517558599680000,1, 944578196742891110400000] |