n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 7 |
3 | 10 |
4 | 40 |
5 | 70 |
6 | 100 |
7 | 400 |
8 | 700 |
9 | 1000 |
10 | 4000 |
11 | 7000 |
12 | 10000 |
13 | 40000 |
14 | 70000 |
15 | 100000 |
16 | 400000 |
17 | 700000 |
18 | 1000000 |
19 | 4000000 |
20 | 7000000 |
21 | 10000000 |
22 | 40000000 |
23 | 70000000 |
24 | 100000000 |
25 | 400000000 |
26 | 700000000 |
27 | 1000000000 |
28 | 4000000000 |
29 | 7000000000 |
[1,4,7,10,40,70,100,400,700,1000,4000,7000,10000, 40000,70000,100000,400000,700000,1000000,4000000, 7000000,10000000,40000000,70000000,100000000, 400000000,700000000,1000000000,4000000000, 7000000000] |