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| n | a(n) |
|---|---|
| 1 | -1 |
| 2 | 14 |
| 3 | 4 |
| 4 | -1 |
| 5 | 1014 |
| 6 | 1004 |
| 7 | 30 |
| 8 | 40 |
| 9 | 24 |
| 10 | 1030 |
| 11 | 34 |
| 12 | 44 |
| 13 | 54 |
| 14 | 140 |
| 15 | 124 |
| 16 | 404 |
| 17 | 134 |
| 18 | 144 |
| 19 | 154 |
| 20 | 324 |
| 21 | 234 |
| 22 | 244 |
| 23 | 254 |
| 24 | 354 |
| 25 | 444 |
| 26 | 454 |
| 27 | 1354 |
| 28 | 1444 |
| 29 | 1454 |
| 30 | 2354 |
| 31 | 2444 |
| 32 | 2454 |
| 33 | 3454 |
| 34 | 4444 |
| 35 | 4454 |
[-1,14,4,-1,1014,1004,30,40,24,1030,34,44,54,140, 124,404,134,144,154,324,234,244,254,354,444,454, 1354,1444,1454,2354,2444,2454,3454,4444,4454] |