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| n | a(n) |
|---|---|
| 1 | -1 |
| 2 | 18 |
| 3 | 27 |
| 4 | -1 |
| 5 | 36 |
| 6 | 38 |
| 7 | 44 |
| 8 | 35 |
| 9 | -1 |
| 10 | 26 |
| 11 | 16 |
| 12 | 24 |
| 13 | 14 |
| 14 | 35 |
| 15 | 18 |
| 16 | -1 |
| 17 | 19 |
| 18 | 35 |
| 19 | 24 |
| 20 | 36 |
| 21 | 27 |
| 22 | 12 |
| 23 | 26 |
| 24 | 51 |
| 25 | -1 |
| 26 | 39 |
| 27 | 16 |
| 28 | 37 |
| 29 | 26 |
| 30 | 25 |
| 31 | 16 |
| 32 | 22 |
| 33 | 23 |
| 34 | 36 |
| 35 | 19 |
| 36 | -1 |
| 37 | 25 |
| 38 | 25 |
| 39 | 25 |
| 40 | 40 |
| 41 | 57 |
| 42 | 56 |
| 43 | 24 |
| 44 | 11 |
| 45 | 24 |
| 46 | 21 |
| 47 | 23 |
| 48 | 26 |
| 49 | -1 |
| 50 | 33 |
| 51 | 47 |
| 52 | 22 |
| 53 | 40 |
| 54 | 48 |
| 55 | 22 |
| 56 | 31 |
| 57 | 31 |
| 58 | 22 |
| 59 | 29 |
| 60 | 18 |
| 61 | 16 |
| 62 | 30 |
| 63 | 26 |
| 64 | -1 |
| 65 | 24 |
[-1,18,27,-1,36,38,44,35,-1,26,16,24,14,35,18,-1, 19,35,24,36,27,12,26,51,-1,39,16,37,26,25,16,22, 23,36,19,-1,25,25,25,40,57,56,24,11,24,21,23,26, -1,33,47,22,40,48,22,31,31,22,29,18,16,30,26,-1, 24] |