n | a(n) |
---|---|
1 | 1 |
2 | 8 |
3 | 20 |
4 | 120 |
5 | 496 |
6 | 2304 |
7 | 10240 |
8 | 46208 |
9 | 207360 |
10 | 932352 |
11 | 4189184 |
12 | 18827264 |
13 | 84606976 |
14 | 380223488 |
15 | 1708703744 |
16 | 7678853120 |
17 | 34508439552 |
18 | 155079540736 |
19 | 696921096192 |
20 | 3131935031296 |
21 | 14074788184064 |
22 | 63251524091904 |
[1,8,20,120,496,2304,10240,46208,207360,932352, 4189184,18827264,84606976,380223488,1708703744, 7678853120,34508439552,155079540736,696921096192, 3131935031296,14074788184064,63251524091904] |