n | a(n) |
---|---|
0 | 3 |
1 | 7 |
2 | 18 |
3 | 50 |
4 | 145 |
5 | 429 |
6 | 1280 |
7 | 3832 |
8 | 11487 |
9 | 34451 |
10 | 103342 |
11 | 310014 |
12 | 930029 |
13 | 2790073 |
14 | 8370204 |
15 | 25110596 |
16 | 75331771 |
17 | 225995295 |
18 | 677985866 |
19 | 2033957578 |
20 | 6101872713 |
21 | 18305618117 |
22 | 54916854328 |
23 | 164750562960 |
24 | 494251688855 |
25 | 1482755066539 |
[3,7,18,50,145,429,1280,3832,11487,34451,103342, 310014,930029,2790073,8370204,25110596,75331771, 225995295,677985866,2033957578,6101872713, 18305618117,54916854328,164750562960,494251688855, 1482755066539] |