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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 5 |
| 4 | 11 |
| 5 | 31 |
| 6 | 35 |
| 7 | 91 |
| 8 | 191 |
| 9 | 211 |
| 10 | 215 |
| 11 | 671 |
| 12 | 1171 |
| 13 | 1271 |
| 14 | 1291 |
| 15 | 1295 |
| 16 | 4651 |
| 17 | 7151 |
| 18 | 7651 |
| 19 | 7751 |
| 20 | 7771 |
| 21 | 7775 |
| 22 | 31031 |
| 23 | 43531 |
| 24 | 46031 |
| 25 | 46531 |
| 26 | 46631 |
| 27 | 46651 |
| 28 | 46655 |
| 29 | 201811 |
| 30 | 264311 |
| 31 | 276811 |
| 32 | 279311 |
| 33 | 279811 |
| 34 | 279911 |
| 35 | 279931 |
| 36 | 279935 |
| 37 | 312071 |
| 38 | 1288991 |
| 39 | 1601491 |
| 40 | 1663991 |
[0,1,5,11,31,35,91,191,211,215,671,1171,1271,1291, 1295,4651,7151,7651,7751,7771,7775,31031,43531, 46031,46531,46631,46651,46655,201811,264311, 276811,279311,279811,279911,279931,279935,312071, 1288991,1601491,1663991] |