n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 2 |
4 | 20 |
5 | 256 |
6 | 2086 |
7 | 16376 |
8 | 121418 |
9 | 871258 |
10 | 6077730 |
11 | 41586532 |
12 | 280783434 |
13 | 1875742356 |
14 | 12432917916 |
15 | 81868580330 |
16 | 536476588416 |
17 | 3501125753910 |
18 | 22778101455784 |
[0,0,2,20,256,2086,16376,121418,871258,6077730, 41586532,280783434,1875742356,12432917916, 81868580330,536476588416,3501125753910, 22778101455784] |