n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 12 |
6 | 39 |
7 | 138 |
8 | 503 |
9 | 1864 |
10 | 6936 |
11 | 25868 |
12 | 96512 |
13 | 360203 |
14 | 1344408 |
15 | 5018051 |
16 | 18729944 |
17 | 69910398 |
18 | 260943079 |
19 | 973980990 |
20 | 3635421345 |
21 | 13569354266 |
22 | 50648137765 |
23 | 189046143161 |
[1,1,2,4,12,39,138,503,1864,6936,25868,96512, 360203,1344408,5018051,18729944,69910398, 260943079,973980990,3635421345,13569354266, 50648137765,189046143161] |