n | a(n) |
---|---|
1 | 3 |
2 | 20 |
3 | 68 |
4 | 225 |
5 | 627 |
6 | 2152 |
7 | 7036 |
8 | 22392 |
9 | 74381 |
10 | 241819 |
11 | 793240 |
12 | 2604908 |
13 | 8530131 |
14 | 28013101 |
15 | 91893580 |
16 | 301557767 |
17 | 989945590 |
18 | 3248890744 |
19 | 10664829792 |
20 | 35007809686 |
21 | 114914687393 |
22 | 377229380984 |
23 | 1238309771635 |
24 | 4064987753276 |
[3,20,68,225,627,2152,7036,22392,74381,241819, 793240,2604908,8530131,28013101,91893580, 301557767,989945590,3248890744,10664829792, 35007809686,114914687393,377229380984, 1238309771635,4064987753276] |