n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 1 |
4 | 3 |
5 | 9 |
6 | 27 |
7 | 78 |
8 | 249 |
9 | 782 |
10 | 2574 |
11 | 8676 |
12 | 29714 |
13 | 102162 |
14 | 356797 |
15 | 1268990 |
16 | 4521769 |
17 | 16134137 |
18 | 58061535 |
19 | 210499244 |
20 | 767154326 |
21 | 2809323733 |
22 | 10342098153 |
23 | 38281849044 |
24 | 142249547127 |
25 | 527095215036 |
26 | 1966843667482 |
27 | 7368829743507 |
28 | 27636276043171 |
29 | 103876045792060 |
[1,0,1,3,9,27,78,249,782,2574,8676,29714,102162, 356797,1268990,4521769,16134137,58061535, 210499244,767154326,2809323733,10342098153, 38281849044,142249547127,527095215036, 1966843667482,7368829743507,27636276043171, 103876045792060] |