n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 12 |
4 | 96 |
5 | 840 |
6 | 9720 |
7 | 143640 |
8 | 2399040 |
9 | 45239040 |
10 | 976752000 |
11 | 23537606400 |
12 | 621444700800 |
13 | 17936155036800 |
14 | 562855739846400 |
15 | 19038932398886400 |
16 | 690456599575142400 |
17 | 26748823900403404800 |
18 | 1102407824344284057600 |
19 | 48147134965603914240000 |
[1,1,2,12,96,840,9720,143640,2399040,45239040, 976752000,23537606400,621444700800,17936155036800, 562855739846400,19038932398886400, 690456599575142400,26748823900403404800, 1102407824344284057600,48147134965603914240000] |