n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 40 |
3 | 400 |
4 | 4000 |
5 | 40000 |
6 | 400000 |
7 | 4000000 |
8 | 40000000 |
9 | 400000000 |
10 | 4000000000 |
11 | 40000000000 |
12 | 400000000000 |
13 | 4000000000000 |
14 | 40000000000000 |
15 | 400000000000000 |
16 | 4000000000000000 |
17 | 40000000000000000 |
18 | 400000000000000000 |
19 | 4000000000000000000 |
20 | 40000000000000000000 |
21 | 400000000000000000000 |
[1,4,40,400,4000,40000,400000,4000000,40000000, 400000000,4000000000,40000000000,400000000000, 4000000000000,40000000000000,400000000000000, 4000000000000000,40000000000000000, 400000000000000000,4000000000000000000, 40000000000000000000,400000000000000000000] |