n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 23 |
3 | 192 |
4 | 2184 |
5 | 31728 |
6 | 560412 |
7 | 11630592 |
8 | 276921216 |
9 | 7433925120 |
10 | 222038547840 |
11 | 7301712936960 |
12 | 262112637864960 |
13 | 10198096116526080 |
14 | 427456901317420800 |
15 | 19202256562264473600 |
16 | 920321900537337446400 |
17 | 46874495077202077286400 |
18 | 2528269620326135923507200 |
[1,4,23,192,2184,31728,560412,11630592,276921216, 7433925120,222038547840,7301712936960, 262112637864960,10198096116526080, 427456901317420800,19202256562264473600, 920321900537337446400,46874495077202077286400, 2528269620326135923507200] |