n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 6 |
6 | 3 |
7 | 1 |
8 | 20 |
9 | 204 |
10 | 1056 |
11 | 2850 |
12 | 4080 |
13 | 2940 |
14 | 840 |
15 | 1 |
16 | 400 |
17 | 130899 |
18 | 11230666 |
19 | 347919225 |
20 | 5158324560 |
21 | 43174480650 |
22 | 225086553300 |
23 | 775894225050 |
24 | 1831178115900 |
25 | 3008073915000 |
26 | 3439243962000 |
27 | 2685727044000 |
28 | 1366701336000 |
29 | 408648240000 |
30 | 54486432000 |
[1,1,1,4,6,3,1,20,204,1056,2850,4080,2940,840,1, 400,130899,11230666,347919225,5158324560, 43174480650,225086553300,775894225050, 1831178115900,3008073915000,3439243962000, 2685727044000,1366701336000,408648240000, 54486432000] |