n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 12 |
3 | 40 |
4 | 560 |
5 | 2016 |
6 | 14784 |
7 | 54912 |
8 | 1647360 |
9 | 6223360 |
10 | 47297536 |
11 | 180590592 |
12 | 2769055744 |
13 | 10650214400 |
14 | 82158796800 |
15 | 317680680960 |
16 | 19696202219520 |
17 | 76467608616960 |
18 | 594748067020800 |
19 | 2316387208396800 |
20 | 36135640450990080 |
21 | 141101072237199360 |
22 | 1103153837490831360 |
[1,2,12,40,560,2016,14784,54912,1647360,6223360, 47297536,180590592,2769055744,10650214400, 82158796800,317680680960,19696202219520, 76467608616960,594748067020800,2316387208396800, 36135640450990080,141101072237199360, 1103153837490831360] |