| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 2 |
| 4 | 6 |
| 5 | 3 |
| 6 | 8 |
| 7 | 4 |
| 8 | 10 |
| 9 | 5 |
| 10 | 12 |
| 11 | 6 |
| 12 | 14 |
| 13 | 7 |
| 14 | 16 |
| 15 | 8 |
| 16 | 18 |
| 17 | 9 |
| 18 | 20 |
| 19 | 10 |
| 20 | 22 |
| 21 | 11 |
| 22 | 24 |
| 23 | 12 |
| 24 | 26 |
| 25 | 13 |
| 26 | 28 |
| 27 | 14 |
| 28 | 30 |
| 29 | 15 |
| 30 | 32 |
| 31 | 16 |
| 32 | 34 |
| 33 | 17 |
| 34 | 36 |
| 35 | 18 |
| 36 | 38 |
| 37 | 19 |
| 38 | 40 |
| 39 | 20 |
| 40 | 42 |
| 41 | 21 |
| 42 | 44 |
| 43 | 22 |
| 44 | 46 |
| 45 | 23 |
| 46 | 48 |
| 47 | 24 |
| 48 | 50 |
| 49 | 25 |
| 50 | 52 |
| 51 | 26 |
| 52 | 54 |
| 53 | 27 |
| 54 | 56 |
| 55 | 28 |
| 56 | 58 |
| 57 | 29 |
| 58 | 60 |
| 59 | 30 |
| 60 | 62 |
| 61 | 31 |
| 62 | 64 |
| 63 | 32 |
| 64 | 66 |
| 65 | 33 |
| 66 | 68 |
| 67 | 34 |
| 68 | 70 |
| 69 | 35 |
| 70 | 72 |
| 71 | 36 |
| 72 | 74 |
| 73 | 37 |
[1,4,2,6,3,8,4,10,5,12,6,14,7,16,8,18,9,20,10,22, 11,24,12,26,13,28,14,30,15,32,16,34,17,36,18,38, 19,40,20,42,21,44,22,46,23,48,24,50,25,52,26,54, 27,56,28,58,29,60,30,62,31,64,32,66,33,68,34,70, 35,72,36,74,37] |