The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 5 |
| 5 | 8 |
| 6 | 10 |
| 7 | 16 |
| 8 | 20 |
| 9 | 25 |
| 10 | 40 |
| 11 | 50 |
| 12 | 80 |
| 13 | 100 |
| 14 | 125 |
| 15 | 200 |
| 16 | 250 |
| 17 | 400 |
| 18 | 500 |
| 19 | 1000 |
| 20 | 2000 |
[1,2,4,5,8,10,16,20,25,40,50,80,100,125,200,250, 400,500,1000,2000] |