n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 30 |
4 | 192 |
5 | 1520 |
6 | 14220 |
7 | 153720 |
8 | 1881600 |
9 | 25728192 |
10 | 388402560 |
11 | 6415960320 |
12 | 115078138560 |
13 | 2227056923520 |
14 | 46247253212160 |
15 | 1025696098627200 |
16 | 24195406204569600 |
17 | 604862279807385600 |
18 | 15973029429800002560 |
19 | 444299711254300661760 |
20 | 12983645995613669376000 |
[1,2,6,30,192,1520,14220,153720,1881600,25728192, 388402560,6415960320,115078138560,2227056923520, 46247253212160,1025696098627200,24195406204569600, 604862279807385600,15973029429800002560, 444299711254300661760,12983645995613669376000] |