n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 3 |
4 | 8 |
5 | 20 |
6 | 45 |
7 | 144 |
8 | 448 |
9 | 1680 |
10 | 4725 |
11 | 17280 |
12 | 62208 |
13 | 290304 |
14 | 1254400 |
15 | 4465125 |
16 | 18144000 |
17 | 72990720 |
18 | 391910400 |
19 | 1881169920 |
20 | 9754214400 |
21 | 45660160000 |
22 | 205752960000 |
23 | 905748480000 |
24 | 5280992640000 |
25 | 28326238617600 |
26 | 162956344320000 |
27 | 853298675712000 |
28 | 5309413982208000 |
[1,2,3,8,20,45,144,448,1680,4725,17280,62208, 290304,1254400,4465125,18144000,72990720, 391910400,1881169920,9754214400,45660160000, 205752960000,905748480000,5280992640000, 28326238617600,162956344320000,853298675712000, 5309413982208000] |