n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 3 |
4 | 8 |
5 | 15 |
6 | 144 |
7 | 420 |
8 | 5760 |
9 | 4536 |
10 | 403200 |
11 | 1995840 |
12 | 6220800 |
13 | 259459200 |
14 | 1341204480 |
15 | 46702656000 |
16 | 1394852659200 |
17 | 11115232128000 |
18 | 376610217984000 |
19 | 96543730483200 |
20 | 128047474114560000 |
21 | 1277273554292736000 |
[1,1,2,3,8,15,144,420,5760,4536,403200,1995840, 6220800,259459200,1341204480,46702656000, 1394852659200,11115232128000,376610217984000, 96543730483200,128047474114560000, 1277273554292736000] |