n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 12 |
3 | 60 |
4 | 700 |
5 | 3780 |
6 | 51744 |
7 | 288288 |
8 | 4247100 |
9 | 24066900 |
10 | 369881512 |
11 | 2118412296 |
12 | 33466634656 |
13 | 193076738400 |
14 | 3109838832000 |
15 | 18037065225600 |
16 | 294718130342460 |
17 | 1716299700229620 |
18 | 28355714001615000 |
19 | 165657066009435000 |
20 | 2761067350729888200 |
21 | 16171965911417916600 |
[1,2,12,60,700,3780,51744,288288,4247100,24066900, 369881512,2118412296,33466634656,193076738400, 3109838832000,18037065225600,294718130342460, 1716299700229620,28355714001615000, 165657066009435000,2761067350729888200, 16171965911417916600] |