n | a(n) |
---|---|
0 | 0 |
1 | 6 |
2 | 57 |
3 | 468 |
4 | 3564 |
5 | 25920 |
6 | 182736 |
7 | 1259712 |
8 | 8538048 |
9 | 57106944 |
10 | 377913600 |
11 | 2479113216 |
12 | 16144468992 |
13 | 104485552128 |
14 | 672625741824 |
15 | 4310029025280 |
16 | 27505821597696 |
17 | 174908814262272 |
18 | 1108696193630208 |
19 | 7007637010120704 |
20 | 44178581150760960 |
21 | 277868041444786176 |
[0,6,57,468,3564,25920,182736,1259712,8538048, 57106944,377913600,2479113216,16144468992, 104485552128,672625741824,4310029025280, 27505821597696,174908814262272,1108696193630208, 7007637010120704,44178581150760960, 277868041444786176] |