n | a(n) |
---|---|
0 | 1 |
1 | 9 |
2 | 54 |
3 | 264 |
4 | 1134 |
5 | 4446 |
6 | 16272 |
7 | 56412 |
8 | 187137 |
9 | 598417 |
10 | 1854882 |
11 | 5597172 |
12 | 16498632 |
13 | 47638512 |
14 | 135048672 |
15 | 376592064 |
16 | 1034663040 |
17 | 2804590080 |
18 | 7509232640 |
19 | 19880294400 |
20 | 52088352768 |
21 | 135173578752 |
22 | 347680161792 |
23 | 886900948992 |
24 | 2245014454272 |
25 | 5641949085696 |
[1,9,54,264,1134,4446,16272,56412,187137,598417, 1854882,5597172,16498632,47638512,135048672, 376592064,1034663040,2804590080,7509232640, 19880294400,52088352768,135173578752,347680161792, 886900948992,2245014454272,5641949085696] |