| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 8 |
| 6 | 20 |
| 7 | 22 |
| 8 | 40 |
| 9 | 44 |
| 10 | 60 |
| 11 | 66 |
| 12 | 80 |
| 13 | 88 |
| 14 | 200 |
| 15 | 202 |
| 16 | 204 |
| 17 | 220 |
| 18 | 222 |
| 19 | 240 |
| 20 | 244 |
| 21 | 248 |
| 22 | 284 |
| 23 | 400 |
| 24 | 404 |
| 25 | 408 |
| 26 | 420 |
| 27 | 440 |
| 28 | 444 |
| 29 | 480 |
| 30 | 488 |
| 31 | 600 |
| 32 | 606 |
| 33 | 648 |
| 34 | 660 |
| 35 | 666 |
| 36 | 684 |
| 37 | 800 |
| 38 | 808 |
| 39 | 840 |
| 40 | 880 |
| 41 | 888 |
| 42 | 2000 |
| 43 | 2002 |
| 44 | 2004 |
| 45 | 2008 |
| 46 | 2020 |
| 47 | 2022 |
| 48 | 2040 |
| 49 | 2044 |
| 50 | 2080 |
| 51 | 2088 |
| 52 | 2200 |
| 53 | 2202 |
[0,2,4,6,8,20,22,40,44,60,66,80,88,200,202,204, 220,222,240,244,248,284,400,404,408,420,440,444, 480,488,600,606,648,660,666,684,800,808,840,880, 888,2000,2002,2004,2008,2020,2022,2040,2044,2080, 2088,2200,2202] |