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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 11 |
| 3 | 0 |
| 4 | 1117 |
| 5 | 11117 |
| 6 | 0 |
| 7 | 1111447 |
| 8 | 11111117 |
| 9 | 0 |
| 10 | 1111111411 |
| 11 | 11111111741 |
| 12 | 0 |
| 13 | 1111111111177 |
| 14 | 11111111111411 |
| 15 | 0 |
| 16 | 1111111111111447 |
| 17 | 11111111111111171 |
| 18 | 0 |
| 19 | 1111111111111111111 |
| 20 | 11111111111111111447 |
| 21 | 0 |
| 22 | 1111111111111111111711 |
[7,11,0,1117,11117,0,1111447,11111117,0, 1111111411,11111111741,0,1111111111177, 11111111111411,0,1111111111111447, 11111111111111171,0,1111111111111111111, 11111111111111111447,0,1111111111111111111711] |