n | a(n) |
---|---|
1 | 1 |
2 | 2 |
3 | 3 |
4 | 6 |
5 | 11 |
6 | 29 |
7 | 90 |
8 | 447 |
9 | 2777 |
10 | 21492 |
11 | 189275 |
12 | 1875602 |
13 | 20491475 |
14 | 244801738 |
15 | 3171481173 |
16 | 44283667569 |
17 | 662856700938 |
18 | 10587645550783 |
19 | 179737770922111 |
20 | 3231504327224830 |
[1,2,3,6,11,29,90,447,2777,21492,189275,1875602, 20491475,244801738,3171481173,44283667569, 662856700938,10587645550783,179737770922111, 3231504327224830] |