n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 4 |
3 | 44 |
4 | 408 |
5 | 3688 |
6 | 33212 |
7 | 298932 |
8 | 2690416 |
9 | 24213776 |
10 | 217924020 |
11 | 1961316220 |
12 | 17651846024 |
13 | 158866614264 |
14 | 1429799528428 |
15 | 12868195755908 |
16 | 115813761803232 |
17 | 1042323856229152 |
18 | 9380914706062436 |
19 | 84428232354561996 |
20 | 759854091191058040 |
[0,0,4,44,408,3688,33212,298932,2690416,24213776, 217924020,1961316220,17651846024,158866614264, 1429799528428,12868195755908,115813761803232, 1042323856229152,9380914706062436, 84428232354561996,759854091191058040] |