n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 3 |
4 | 0 |
5 | 30 |
6 | 90 |
7 | 588 |
8 | 5040 |
9 | 26520 |
10 | 325080 |
11 | 2158728 |
12 | 27731880 |
13 | 249259920 |
14 | 3181258080 |
15 | 36821629848 |
16 | 482278043520 |
17 | 6704476956480 |
18 | 93675256079040 |
19 | 1479108131816448 |
20 | 22566722722104960 |
21 | 390679249452835200 |
22 | 6559255213047250560 |
23 | 122197022127873558528 |
[1,0,0,3,0,30,90,588,5040,26520,325080,2158728, 27731880,249259920,3181258080,36821629848, 482278043520,6704476956480,93675256079040, 1479108131816448,22566722722104960, 390679249452835200,6559255213047250560, 122197022127873558528] |