n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 18 |
4 | 58 |
5 | 186 |
6 | 602 |
7 | 1946 |
8 | 6298 |
9 | 20378 |
10 | 65946 |
11 | 213402 |
12 | 690586 |
13 | 2234778 |
14 | 7231898 |
15 | 23402906 |
16 | 75733402 |
17 | 245078426 |
18 | 793090458 |
19 | 2566494618 |
20 | 8305351066 |
21 | 26876680602 |
22 | 86974765466 |
23 | 281456253338 |
24 | 910811568538 |
25 | 2947448150426 |
26 | 9538142575002 |
27 | 30866077751706 |
[1,2,6,18,58,186,602,1946,6298,20378,65946,213402, 690586,2234778,7231898,23402906,75733402, 245078426,793090458,2566494618,8305351066, 26876680602,86974765466,281456253338,910811568538, 2947448150426,9538142575002,30866077751706] |