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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 4 |
| 6 | 7 |
| 7 | 6 |
| 8 | 9 |
| 9 | 10 |
| 10 | 11 |
| 11 | 10 |
| 12 | 13 |
| 13 | 12 |
| 14 | 15 |
| 15 | 16 |
| 16 | 17 |
| 17 | 16 |
| 18 | 19 |
| 19 | 18 |
| 20 | 21 |
| 21 | 22 |
| 22 | 23 |
| 23 | 22 |
| 24 | 25 |
| 25 | 26 |
| 26 | 27 |
| 27 | 28 |
| 28 | 29 |
| 29 | 28 |
| 30 | 31 |
| 31 | 30 |
| 32 | 33 |
| 33 | 34 |
| 34 | 35 |
| 35 | 36 |
| 36 | 37 |
| 37 | 36 |
| 38 | 39 |
| 39 | 40 |
| 40 | 41 |
| 41 | 40 |
| 42 | 43 |
| 43 | 42 |
| 44 | 45 |
| 45 | 46 |
| 46 | 47 |
| 47 | 46 |
| 48 | 49 |
| 49 | 50 |
| 50 | 51 |
| 51 | 52 |
| 52 | 53 |
| 53 | 52 |
| 54 | 55 |
| 55 | 56 |
| 56 | 57 |
| 57 | 58 |
| 58 | 59 |
| 59 | 58 |
| 60 | 61 |
| 61 | 60 |
| 62 | 63 |
| 63 | 64 |
| 64 | 65 |
| 65 | 66 |
| 66 | 67 |
| 67 | 66 |
| 68 | 69 |
| 69 | 70 |
| 70 | 71 |
| 71 | 70 |
| 72 | 73 |
[2,1,2,5,4,7,6,9,10,11,10,13,12,15,16,17,16,19,18, 21,22,23,22,25,26,27,28,29,28,31,30,33,34,35,36, 37,36,39,40,41,40,43,42,45,46,47,46,49,50,51,52, 53,52,55,56,57,58,59,58,61,60,63,64,65,66,67,66, 69,70,71,70,73] |