n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 1 |
6 | 30 |
7 | 735 |
8 | 17920 |
9 | 459270 |
10 | 12600000 |
11 | 372027810 |
12 | 11824496640 |
13 | 403786706895 |
14 | 14772648450560 |
15 | 577227041015625 |
16 | 24013333950627840 |
17 | 1060372471758165020 |
18 | 49558656380297379840 |
19 | 2444960458495625410260 |
20 | 127008768000000000000000 |
[0,0,0,0,1,30,735,17920,459270,12600000,372027810, 11824496640,403786706895,14772648450560, 577227041015625,24013333950627840, 1060372471758165020,49558656380297379840, 2444960458495625410260,127008768000000000000000] |