n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 28 |
4 | 160 |
5 | 976 |
6 | 5824 |
7 | 35008 |
8 | 209920 |
9 | 1259776 |
10 | 7558144 |
11 | 45349888 |
12 | 272097280 |
13 | 1632587776 |
14 | 9795518464 |
15 | 58773127168 |
16 | 352638730240 |
17 | 2115832446976 |
18 | 12694994550784 |
19 | 76169967566848 |
20 | 457019804876800 |
21 | 2742118830309376 |
22 | 16452712979759104 |
[0,1,4,28,160,976,5824,35008,209920,1259776, 7558144,45349888,272097280,1632587776,9795518464, 58773127168,352638730240,2115832446976, 12694994550784,76169967566848,457019804876800, 2742118830309376,16452712979759104] |