n | a(n) |
---|---|
0 | 1 |
1 | 18 |
2 | 189 |
3 | 1482 |
4 | 9576 |
5 | 53676 |
6 | 269325 |
7 | 1235286 |
8 | 5256711 |
9 | 20985272 |
10 | 79260723 |
11 | 285139764 |
12 | 982349361 |
13 | 3255488082 |
14 | 10416507579 |
15 | 32281134120 |
16 | 97154549289 |
17 | 284625019800 |
18 | 813310723925 |
19 | 2270826800172 |
20 | 6204926551824 |
21 | 16615751700618 |
[1,18,189,1482,9576,53676,269325,1235286,5256711, 20985272,79260723,285139764,982349361,3255488082, 10416507579,32281134120,97154549289,284625019800, 813310723925,2270826800172,6204926551824, 16615751700618] |