n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | -6 |
4 | 18 |
5 | -60 |
6 | 214 |
7 | -714 |
8 | 984 |
9 | 23040 |
10 | -468880 |
11 | 7113040 |
12 | -102747560 |
13 | 1501609200 |
14 | -22698373400 |
15 | 358125772200 |
16 | -5919450952000 |
17 | 102619545932800 |
18 | -1865622384074400 |
19 | 35539903321740000 |
20 | -708618759088892000 |
21 | 14768814409403208000 |
[0,0,2,-6,18,-60,214,-714,984,23040,-468880, 7113040,-102747560,1501609200,-22698373400, 358125772200,-5919450952000,102619545932800, -1865622384074400,35539903321740000, -708618759088892000,14768814409403208000] |