n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 1 |
6 | 2 |
7 | 3 |
8 | 8 |
9 | 15 |
10 | 48 |
11 | 210 |
12 | 1152 |
13 | 3780 |
14 | 19200 |
15 | 62370 |
16 | 322560 |
17 | 2162160 |
18 | 17418240 |
19 | 81081000 |
20 | 567705600 |
21 | 2481078600 |
22 | 16907304960 |
23 | 146659312800 |
24 | 1504935936000 |
25 | 8799558768000 |
26 | 76435881984000 |
27 | 819678899239200 |
[1,1,1,1,1,2,3,8,15,48,210,1152,3780,19200,62370, 322560,2162160,17418240,81081000,567705600, 2481078600,16907304960,146659312800,1504935936000, 8799558768000,76435881984000,819678899239200] |