The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 16 |
| 6 | 31 |
| 7 | 32 |
| 8 | 64 |
| 9 | 103 |
| 10 | 128 |
| 11 | 171 |
| 12 | 213 |
| 13 | 256 |
| 14 | 301 |
| 15 | 342 |
| 16 | 439 |
| 17 | 475 |
| 18 | 494 |
| 19 | 512 |
| 20 | 558 |
[1,2,4,8,16,31,32,64,103,128,171,213,256,301,342, 439,475,494,512,558] |