n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 27 |
4 | 158 |
5 | 981 |
6 | 6342 |
7 | 42728 |
8 | 295008 |
9 | 2079882 |
10 | 14908740 |
11 | 108312873 |
12 | 795836544 |
13 | 5903472999 |
14 | 44151306690 |
15 | 332552305818 |
16 | 2520416719368 |
17 | 19207222744326 |
18 | 147086508325056 |
19 | 1131292622149352 |
20 | 8735383810590486 |
[1,1,6,27,158,981,6342,42728,295008,2079882, 14908740,108312873,795836544,5903472999, 44151306690,332552305818,2520416719368, 19207222744326,147086508325056,1131292622149352, 8735383810590486] |