n | a(n) |
---|---|
1 | 3 |
2 | 1 |
3 | 1 |
4 | 3 |
5 | 9 |
6 | 28 |
7 | 87 |
8 | 270 |
9 | 838 |
10 | 2682 |
11 | 8568 |
12 | 27325 |
13 | 87087 |
14 | 284940 |
15 | 929773 |
16 | 3026424 |
17 | 9843471 |
18 | 32691629 |
19 | 108290562 |
20 | 357839667 |
21 | 1181136576 |
22 | 3967571310 |
23 | 13290977466 |
24 | 44410377199 |
25 | 148240940865 |
26 | 501864577470 |
27 | 1694984858142 |
28 | 5711630686332 |
[3,1,1,3,9,28,87,270,838,2682,8568,27325,87087, 284940,929773,3026424,9843471,32691629,108290562, 357839667,1181136576,3967571310,13290977466, 44410377199,148240940865,501864577470, 1694984858142,5711630686332] |