n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | -2 |
3 | 0 |
4 | 12 |
5 | 0 |
6 | -120 |
7 | 0 |
8 | 1680 |
9 | 0 |
10 | -30240 |
11 | 0 |
12 | 665280 |
13 | 0 |
14 | -17297280 |
15 | 0 |
16 | 518918400 |
17 | 0 |
18 | -17643225600 |
19 | 0 |
20 | 670442572800 |
21 | 0 |
22 | -28158588057600 |
23 | 0 |
24 | 1295295050649600 |
25 | 0 |
26 | -64764752532480000 |
27 | 0 |
28 | 3497296636753920000 |
29 | 0 |
30 | -202843204931727360000 |
31 | 0 |
[1,0,-2,0,12,0,-120,0,1680,0,-30240,0,665280,0, -17297280,0,518918400,0,-17643225600,0, 670442572800,0,-28158588057600,0,1295295050649600, 0,-64764752532480000,0,3497296636753920000,0, -202843204931727360000,0] |