n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 18 |
3 | 144 |
4 | 1422 |
5 | 16848 |
6 | 235458 |
7 | 3827628 |
8 | 71466174 |
9 | 1515031920 |
10 | 36091609434 |
11 | 957367079244 |
12 | 28050237910926 |
13 | 901359663633000 |
14 | 31567805908329330 |
15 | 1198307340146774844 |
16 | 49060139971072916142 |
17 | 2156816501291429473248 |
[1,3,18,144,1422,16848,235458,3827628,71466174, 1515031920,36091609434,957367079244, 28050237910926,901359663633000,31567805908329330, 1198307340146774844,49060139971072916142, 2156816501291429473248] |