n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 48 |
5 | 360 |
6 | 2880 |
7 | 25200 |
8 | 282240 |
9 | 3628800 |
10 | 50803200 |
11 | 758419200 |
12 | 12454041600 |
13 | 224172748800 |
14 | 4358914560000 |
15 | 90229531392000 |
16 | 1987665039360000 |
17 | 46595053080576000 |
18 | 1158829640736768000 |
19 | 30411275102208000000 |
20 | 839351192820940800000 |
21 | 24319288473733693440000 |
[1,1,2,6,48,360,2880,25200,282240,3628800, 50803200,758419200,12454041600,224172748800, 4358914560000,90229531392000,1987665039360000, 46595053080576000,1158829640736768000, 30411275102208000000,839351192820940800000, 24319288473733693440000] |