n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 27 |
5 | 135 |
6 | 810 |
7 | 5670 |
8 | 45465 |
9 | 409185 |
10 | 4091850 |
11 | 45010350 |
12 | 540134595 |
13 | 7021749735 |
14 | 98304496290 |
15 | 1474567444350 |
16 | 23593081136625 |
17 | 401082379322625 |
18 | 7219482827807250 |
19 | 137170173728337750 |
20 | 2743403475221484075 |
[1,1,2,6,27,135,810,5670,45465,409185,4091850, 45010350,540134595,7021749735,98304496290, 1474567444350,23593081136625,401082379322625, 7219482827807250,137170173728337750, 2743403475221484075] |