n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 30 |
5 | 210 |
6 | 2310 |
7 | 34650 |
8 | 762300 |
9 | 22869000 |
10 | 960498000 |
11 | 53787888000 |
12 | 4141667376000 |
13 | 418308404976000 |
14 | 56471634671760000 |
15 | 9939007702229760000 |
16 | 2295910779215074560000 |
17 | 681885501426877144320000 |
18 | 262525918049347700563200000 |
19 | 128637699844180373275968000000 |
[1,1,2,6,30,210,2310,34650,762300,22869000, 960498000,53787888000,4141667376000, 418308404976000,56471634671760000, 9939007702229760000,2295910779215074560000, 681885501426877144320000, 262525918049347700563200000, 128637699844180373275968000000] |