n | a(n) |
---|---|
1 | 0 |
2 | 6 |
3 | 42 |
4 | 288 |
5 | 1992 |
6 | 13980 |
7 | 99432 |
8 | 715344 |
9 | 5196336 |
10 | 38056284 |
11 | 280658100 |
12 | 2082218160 |
13 | 15528409920 |
14 | 116331315360 |
15 | 874985339760 |
16 | 6604555554720 |
17 | 50010373864416 |
18 | 379760762209692 |
19 | 2891169309592548 |
20 | 22062102167330592 |
[0,6,42,288,1992,13980,99432,715344,5196336, 38056284,280658100,2082218160,15528409920, 116331315360,874985339760,6604555554720, 50010373864416,379760762209692,2891169309592548, 22062102167330592] |