n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 3 |
4 | -4 |
5 | 30 |
6 | 954 |
7 | 6300 |
8 | 6432 |
9 | 424872 |
10 | 18273960 |
11 | 260682840 |
12 | 1754408424 |
13 | 47063118960 |
14 | 2314149100704 |
15 | 54798086299320 |
16 | 773632032345600 |
17 | 20746972036284480 |
18 | 1072205580591921600 |
19 | 36098491880448944640 |
20 | 816375193722964932480 |
21 | 25160238159364392336000 |
[1,0,2,3,-4,30,954,6300,6432,424872,18273960, 260682840,1754408424,47063118960,2314149100704, 54798086299320,773632032345600,20746972036284480, 1072205580591921600,36098491880448944640, 816375193722964932480,25160238159364392336000] |