n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | -1 |
3 | 1 |
4 | 0 |
5 | -10 |
6 | 90 |
7 | -730 |
8 | 6160 |
9 | -55900 |
10 | 549900 |
11 | -5864300 |
12 | 67610400 |
13 | -839594600 |
14 | 11186357000 |
15 | -159300557000 |
16 | 2416003824000 |
17 | -38894192662000 |
18 | 662595375078000 |
19 | -11911522255750000 |
20 | 225382826562400000 |
[0,1,-1,1,0,-10,90,-730,6160,-55900,549900, -5864300,67610400,-839594600,11186357000, -159300557000,2416003824000,-38894192662000, 662595375078000,-11911522255750000, 225382826562400000] |