n | a(n) |
---|---|
0 | 1 |
1 | 30 |
2 | 420 |
3 | 4200 |
4 | 34650 |
5 | 252252 |
6 | 1681680 |
7 | 10501920 |
8 | 62355150 |
9 | 355655300 |
10 | 1963217256 |
11 | 10546208400 |
12 | 55367594100 |
13 | 285028443000 |
14 | 1442592936000 |
15 | 7193730107520 |
16 | 35406640372950 |
17 | 172255143129300 |
18 | 829376615067000 |
[1,30,420,4200,34650,252252,1681680,10501920, 62355150,355655300,1963217256,10546208400, 55367594100,285028443000,1442592936000, 7193730107520,35406640372950,172255143129300, 829376615067000] |