n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 9 |
4 | 21 |
5 | 51 |
6 | 117 |
7 | 271 |
8 | 607 |
9 | 1363 |
10 | 3013 |
11 | 6643 |
12 | 14491 |
13 | 31495 |
14 | 67965 |
15 | 146115 |
16 | 312483 |
17 | 666015 |
18 | 1413915 |
19 | 2992815 |
20 | 6315135 |
21 | 13292007 |
22 | 27906585 |
23 | 58464339 |
24 | 122229123 |
25 | 255072423 |
26 | 531369483 |
27 | 1105217223 |
28 | 2295383319 |
29 | 4760727375 |
[1,3,9,21,51,117,271,607,1363,3013,6643,14491, 31495,67965,146115,312483,666015,1413915,2992815, 6315135,13292007,27906585,58464339,122229123, 255072423,531369483,1105217223,2295383319, 4760727375] |