n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 9 |
4 | 28 |
5 | 89 |
6 | 286 |
7 | 924 |
8 | 2993 |
9 | 9707 |
10 | 31501 |
11 | 102256 |
12 | 331981 |
13 | 1077870 |
14 | 3499720 |
15 | 11363361 |
16 | 36896355 |
17 | 119801329 |
18 | 388991876 |
19 | 1263047761 |
20 | 4101088878 |
21 | 13316149700 |
22 | 43237262993 |
23 | 140390505643 |
24 | 455845099957 |
25 | 1480119728920 |
[1,3,9,28,89,286,924,2993,9707,31501,102256, 331981,1077870,3499720,11363361,36896355, 119801329,388991876,1263047761,4101088878, 13316149700,43237262993,140390505643,455845099957, 1480119728920] |