n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 6 |
4 | 56 |
5 | 324 |
6 | 2196 |
7 | 13328 |
8 | 83680 |
9 | 512752 |
10 | 3161248 |
11 | 19384848 |
12 | 118981520 |
13 | 729388016 |
14 | 4471790032 |
15 | 27407876144 |
16 | 167983235088 |
17 | 1029494729904 |
18 | 6309251897744 |
19 | 38665450224432 |
20 | 236955187985936 |
21 | 1452135101851056 |
[0,1,6,56,324,2196,13328,83680,512752,3161248, 19384848,118981520,729388016,4471790032, 27407876144,167983235088,1029494729904, 6309251897744,38665450224432,236955187985936, 1452135101851056] |