n | a(n) |
---|---|
1 | 0 |
2 | 3 |
3 | 9 |
4 | 27 |
5 | 147 |
6 | 643 |
7 | 3051 |
8 | 14539 |
9 | 69087 |
10 | 330659 |
11 | 1581181 |
12 | 7568599 |
13 | 36237471 |
14 | 173510451 |
15 | 830875967 |
16 | 3978809357 |
17 | 19053619021 |
18 | 91244122317 |
19 | 436951789203 |
20 | 2092488030843 |
21 | 10020577253545 |
22 | 47986897587643 |
23 | 229801409544101 |
[0,3,9,27,147,643,3051,14539,69087,330659,1581181, 7568599,36237471,173510451,830875967,3978809357, 19053619021,91244122317,436951789203, 2092488030843,10020577253545,47986897587643, 229801409544101] |