n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 18 |
3 | 108 |
4 | 648 |
5 | 3888 |
6 | 23328 |
7 | 139968 |
8 | 839808 |
9 | 5038848 |
10 | 30233088 |
11 | 181398528 |
12 | 1088391168 |
13 | 6530347008 |
14 | 39182082048 |
15 | 235092492288 |
16 | 1410554953728 |
17 | 8463329722368 |
18 | 50779978334208 |
19 | 304679870005248 |
20 | 1828079220031488 |
21 | 10968475320188928 |
22 | 65810851921133568 |
[1,3,18,108,648,3888,23328,139968,839808,5038848, 30233088,181398528,1088391168,6530347008, 39182082048,235092492288,1410554953728, 8463329722368,50779978334208,304679870005248, 1828079220031488,10968475320188928, 65810851921133568] |