n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 18 |
3 | 144 |
4 | 1604 |
5 | 22944 |
6 | 400624 |
7 | 8259680 |
8 | 196358760 |
9 | 5287879092 |
10 | 159094582274 |
11 | 5288950560768 |
12 | 192527721428892 |
13 | 7616404083126180 |
14 | 325361411700398046 |
15 | 14926683772801407168 |
16 | 731947910056020737036 |
17 | 38204289826040411251632 |
18 | 2114787166947079113869760 |
[1,4,18,144,1604,22944,400624,8259680,196358760, 5287879092,159094582274,5288950560768, 192527721428892,7616404083126180, 325361411700398046,14926683772801407168, 731947910056020737036,38204289826040411251632, 2114787166947079113869760] |