n | a(n) |
---|---|
0 | 0 |
1 | 4 |
2 | 48 |
3 | 448 |
4 | 3840 |
5 | 31744 |
6 | 258048 |
7 | 2080768 |
8 | 16711680 |
9 | 133955584 |
10 | 1072693248 |
11 | 8585740288 |
12 | 68702699520 |
13 | 549688705024 |
14 | 4397778075648 |
15 | 35183298347008 |
16 | 281470681743360 |
17 | 2251782633816064 |
18 | 18014329790005248 |
19 | 144114913197948928 |
20 | 1152920405095219200 |
[0,4,48,448,3840,31744,258048,2080768,16711680, 133955584,1072693248,8585740288,68702699520, 549688705024,4397778075648,35183298347008, 281470681743360,2251782633816064, 18014329790005248,144114913197948928, 1152920405095219200] |