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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 11 |
| 3 | 661 |
| 4 | 6661 |
| 5 | 11161 |
| 6 | 111611 |
| 7 | 1111661 |
| 8 | 11111161 |
| 9 | 111616111 |
| 10 | 1111161661 |
| 11 | 11111111611 |
| 12 | 111111111611 |
| 13 | 1111111111661 |
| 14 | 11111111616611 |
| 15 | 111111111116111 |
| 16 | 1111111111616161 |
| 17 | 11111111111611661 |
| 18 | 111111111111111161 |
[0,11,661,6661,11161,111611,1111661,11111161, 111616111,1111161661,11111111611,111111111611, 1111111111661,11111111616611,111111111116111, 1111111111616161,11111111111611661, 111111111111111161] |