n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 13 |
3 | 63 |
4 | 309 |
5 | 1511 |
6 | 7373 |
7 | 35951 |
8 | 175269 |
9 | 854455 |
10 | 4165565 |
11 | 20307647 |
12 | 99002389 |
13 | 482649479 |
14 | 2352978861 |
15 | 11471077391 |
16 | 55922991237 |
17 | 272631840855 |
18 | 1329115610269 |
19 | 6479611111519 |
20 | 31588945184245 |
21 | 154000207833639 |
[1,3,13,63,309,1511,7373,35951,175269,854455, 4165565,20307647,99002389,482649479,2352978861, 11471077391,55922991237,272631840855, 1329115610269,6479611111519,31588945184245, 154000207833639] |