n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 15 |
4 | 114 |
5 | 1170 |
6 | 15570 |
7 | 256410 |
8 | 5103000 |
9 | 119773080 |
10 | 3264445800 |
11 | 101784097800 |
12 | 3591396824400 |
13 | 141958074258000 |
14 | 6236035482877200 |
15 | 302218901402418000 |
16 | 16060366291617648000 |
17 | 930654556409161584000 |
18 | 58524794739862410960000 |
19 | 3976525824684785163792000 |
[1,1,3,15,114,1170,15570,256410,5103000,119773080, 3264445800,101784097800,3591396824400, 141958074258000,6236035482877200, 302218901402418000,16060366291617648000, 930654556409161584000,58524794739862410960000, 3976525824684785163792000] |