n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 6 |
4 | -12 |
5 | 40 |
6 | 180 |
7 | -1512 |
8 | 11760 |
9 | -38880 |
10 | 20160 |
11 | 2106720 |
12 | -22381920 |
13 | 173197440 |
14 | -703999296 |
15 | -1737489600 |
16 | 86030380800 |
17 | -1149696737280 |
18 | 11455162974720 |
19 | -89560399541760 |
20 | 636617260339200 |
21 | -6318191386644480 |
22 | 139398889956480000 |
23 | -3797936822885990400 |
[1,0,0,6,-12,40,180,-1512,11760,-38880,20160, 2106720,-22381920,173197440,-703999296, -1737489600,86030380800,-1149696737280, 11455162974720,-89560399541760,636617260339200, -6318191386644480,139398889956480000, -3797936822885990400] |