n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 2 |
6 | 6 |
7 | 10 |
8 | 60 |
9 | 144 |
10 | 348 |
11 | 8526 |
12 | 8930 |
13 | 322560 |
14 | 210540 |
15 | 7296 |
16 | 7001280 |
17 | 3325069440 |
18 | 176880000 |
19 | 44528400 |
20 | 6398154000 |
21 | 74839427712000 |
22 | 222108480000 |
23 | 52321920 |
24 | 1864464000 |
25 | 5066300010240 |
26 | 1338148188 |
27 | 91406407293961987500 |
[1,1,1,1,2,2,6,10,60,144,348,8526,8930,322560, 210540,7296,7001280,3325069440,176880000,44528400, 6398154000,74839427712000,222108480000,52321920, 1864464000,5066300010240,1338148188, 91406407293961987500] |