n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 18 |
3 | 81 |
4 | 324 |
5 | 1215 |
6 | 4374 |
7 | 15309 |
8 | 52488 |
9 | 177147 |
10 | 590490 |
11 | 1948617 |
12 | 6377292 |
13 | 20726199 |
14 | 66961566 |
15 | 215233605 |
16 | 688747536 |
17 | 2195382771 |
18 | 6973568802 |
19 | 22082967873 |
20 | 69735688020 |
21 | 219667417263 |
22 | 690383311398 |
23 | 2165293113021 |
24 | 6778308875544 |
25 | 21182215236075 |
26 | 66088511536554 |
27 | 205891132094649 |
[0,3,18,81,324,1215,4374,15309,52488,177147, 590490,1948617,6377292,20726199,66961566, 215233605,688747536,2195382771,6973568802, 22082967873,69735688020,219667417263,690383311398, 2165293113021,6778308875544,21182215236075, 66088511536554,205891132094649] |