n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 30 |
5 | 180 |
6 | 1260 |
7 | 10800 |
8 | 104760 |
9 | 1130760 |
10 | 13776480 |
11 | 184044960 |
12 | 2670220080 |
13 | 42222280320 |
14 | 718144004160 |
15 | 13061603808000 |
16 | 254036916144000 |
17 | 5247117638294400 |
18 | 114652672773408000 |
19 | 2647321293055507200 |
20 | 64330669872690566400 |
21 | 1640738743703289331200 |
[1,1,2,6,30,180,1260,10800,104760,1130760, 13776480,184044960,2670220080,42222280320, 718144004160,13061603808000,254036916144000, 5247117638294400,114652672773408000, 2647321293055507200,64330669872690566400, 1640738743703289331200] |