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