| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 9 |
| 3 | 2 |
| 4 | 8 |
| 5 | 3 |
| 6 | 7 |
| 7 | 4 |
| 8 | 6 |
| 9 | 5 |
| 10 | 10 |
| 11 | 11 |
| 12 | 20 |
| 13 | 21 |
| 14 | 30 |
| 15 | 31 |
| 16 | 40 |
| 17 | 41 |
| 18 | 50 |
| 19 | 51 |
| 20 | 49 |
| 21 | 12 |
| 22 | 19 |
| 23 | 22 |
| 24 | 29 |
| 25 | 32 |
| 26 | 39 |
| 27 | 42 |
| 28 | 58 |
| 29 | 13 |
| 30 | 18 |
| 31 | 23 |
| 32 | 28 |
| 33 | 33 |
| 34 | 38 |
| 35 | 43 |
| 36 | 48 |
| 37 | 52 |
| 38 | 53 |
| 39 | 47 |
| 40 | 14 |
| 41 | 17 |
| 42 | 24 |
| 43 | 27 |
| 44 | 34 |
| 45 | 37 |
| 46 | 44 |
| 47 | 56 |
| 48 | 15 |
| 49 | 16 |
| 50 | 25 |
| 51 | 26 |
| 52 | 35 |
| 53 | 36 |
| 54 | 45 |
| 55 | 46 |
| 56 | 54 |
| 57 | 55 |
| 58 | 57 |
| 59 | 59 |
| 60 | 60 |
| 61 | 61 |
| 62 | 62 |
| 63 | 63 |
| 64 | 64 |
| 65 | 65 |
| 66 | 66 |
| 67 | 67 |
| 68 | 68 |
| 69 | 69 |
| 70 | 70 |
| 71 | 71 |
| 72 | 72 |
| 73 | 73 |
| 74 | 74 |
| 75 | 75 |
| 76 | 76 |
| 77 | 77 |
| 78 | 78 |
| 79 | 79 |
| 80 | 80 |
[0,1,9,2,8,3,7,4,6,5,10,11,20,21,30,31,40,41,50, 51,49,12,19,22,29,32,39,42,58,13,18,23,28,33,38, 43,48,52,53,47,14,17,24,27,34,37,44,56,15,16,25, 26,35,36,45,46,54,55,57,59,60,61,62,63,64,65,66, 67,68,69,70,71,72,73,74,75,76,77,78,79,80] |