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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10000 |
| 3 | 11 |
| 4 | 100000000 |
| 5 | 100001 |
| 6 | 110000 |
| 7 | 111 |
| 8 | 1000000000000 |
| 9 | 1000000001 |
| 10 | 1000010000 |
| 11 | 1000011 |
| 12 | 1100000000 |
| 13 | 1100001 |
| 14 | 1110000 |
| 15 | 1111 |
| 16 | 10000000000000000 |
| 17 | 10000000000001 |
| 18 | 10000000010000 |
| 19 | 10000000011 |
| 20 | 10000100000000 |
[1,10000,11,100000000,100001,110000,111, 1000000000000,1000000001,1000010000,1000011, 1100000000,1100001,1110000,1111,10000000000000000, 10000000000001,10000000010000,10000000011, 10000100000000] |