n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 15 |
3 | 81 |
4 | 441 |
5 | 2403 |
6 | 13095 |
7 | 71361 |
8 | 388881 |
9 | 2119203 |
10 | 11548575 |
11 | 62933841 |
12 | 342957321 |
13 | 1868942403 |
14 | 10184782455 |
15 | 55501867521 |
16 | 302456857761 |
17 | 1648235544003 |
18 | 8982042690735 |
19 | 48947549512401 |
20 | 266739169002201 |
[1,3,15,81,441,2403,13095,71361,388881,2119203, 11548575,62933841,342957321,1868942403, 10184782455,55501867521,302456857761, 1648235544003,8982042690735,48947549512401, 266739169002201] |