n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 15 |
3 | 55 |
4 | 216 |
5 | 729 |
6 | 2621 |
7 | 8535 |
8 | 28689 |
9 | 91749 |
10 | 296538 |
11 | 929712 |
12 | 2939063 |
13 | 9093255 |
14 | 28257123 |
15 | 86681608 |
16 | 266368959 |
17 | 811501848 |
18 | 2475331535 |
19 | 7505567037 |
20 | 22772955015 |
21 | 68828023329 |
22 | 208079886258 |
23 | 627418618533 |
24 | 1892181244828 |
25 | 5696253823476 |
26 | 17149663331259 |
[1,3,15,55,216,729,2621,8535,28689,91749,296538, 929712,2939063,9093255,28257123,86681608, 266368959,811501848,2475331535,7505567037, 22772955015,68828023329,208079886258,627418618533, 1892181244828,5696253823476,17149663331259] |