n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 8 |
3 | 45 |
4 | 224 |
5 | 1050 |
6 | 4752 |
7 | 21021 |
8 | 91520 |
9 | 393822 |
10 | 1679600 |
11 | 7113106 |
12 | 29953728 |
13 | 125550100 |
14 | 524190240 |
15 | 2181340125 |
16 | 9051563520 |
17 | 37467344310 |
18 | 154754938800 |
19 | 637982011590 |
20 | 2625648168000 |
21 | 10789623755820 |
22 | 44277560801760 |
23 | 181478535620850 |
24 | 742984788858624 |
[0,1,8,45,224,1050,4752,21021,91520,393822, 1679600,7113106,29953728,125550100,524190240, 2181340125,9051563520,37467344310,154754938800, 637982011590,2625648168000,10789623755820, 44277560801760,181478535620850,742984788858624] |