n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 27 |
3 | 208 |
4 | 1700 |
5 | 14364 |
6 | 123970 |
7 | 1085760 |
8 | 9612108 |
9 | 85795600 |
10 | 770755843 |
11 | 6960408624 |
12 | 63127818572 |
13 | 574609830760 |
14 | 5246348656500 |
15 | 48027225765120 |
16 | 440671237120764 |
17 | 4051508174260272 |
18 | 37315784743418332 |
[1,4,27,208,1700,14364,123970,1085760,9612108, 85795600,770755843,6960408624,63127818572, 574609830760,5246348656500,48027225765120, 440671237120764,4051508174260272, 37315784743418332] |