n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 0 |
3 | -1 |
4 | 2 |
5 | 0 |
6 | -20 |
7 | 100 |
8 | -180 |
9 | -1540 |
10 | 18800 |
11 | -99900 |
12 | -35000 |
13 | 6978400 |
14 | -81010800 |
15 | 418106000 |
16 | 2652650000 |
17 | -89962470000 |
18 | 1078639120000 |
19 | -4572607130000 |
20 | -102140361180000 |
21 | 2809462217120000 |
22 | -34739768494600000 |
23 | 80549366231880000 |
24 | 7017075372032440000 |
[1,1,0,-1,2,0,-20,100,-180,-1540,18800,-99900, -35000,6978400,-81010800,418106000,2652650000, -89962470000,1078639120000,-4572607130000, -102140361180000,2809462217120000, -34739768494600000,80549366231880000, 7017075372032440000] |