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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 4 |
| 4 | 6 |
| 5 | 8 |
| 6 | 20 |
| 7 | 22 |
| 8 | 24 |
| 9 | 26 |
| 10 | 40 |
| 11 | 42 |
| 12 | 44 |
| 13 | 60 |
| 14 | 62 |
| 15 | 80 |
| 16 | 200 |
| 17 | 202 |
| 18 | 204 |
| 19 | 206 |
| 20 | 220 |
| 21 | 222 |
| 22 | 224 |
| 23 | 240 |
| 24 | 242 |
| 25 | 260 |
| 26 | 400 |
| 27 | 402 |
| 28 | 404 |
| 29 | 420 |
| 30 | 422 |
| 31 | 440 |
| 32 | 488 |
| 33 | 600 |
| 34 | 602 |
| 35 | 620 |
| 36 | 668 |
| 37 | 686 |
| 38 | 688 |
| 39 | 800 |
| 40 | 848 |
| 41 | 866 |
| 42 | 868 |
| 43 | 884 |
| 44 | 886 |
| 45 | 888 |
| 46 | 2000 |
| 47 | 2002 |
| 48 | 2004 |
| 49 | 2006 |
| 50 | 2020 |
| 51 | 2022 |
| 52 | 2024 |
| 53 | 2040 |
| 54 | 2042 |
| 55 | 2060 |
| 56 | 2200 |
[0,2,4,6,8,20,22,24,26,40,42,44,60,62,80,200,202, 204,206,220,222,224,240,242,260,400,402,404,420, 422,440,488,600,602,620,668,686,688,800,848,866, 868,884,886,888,2000,2002,2004,2006,2020,2022, 2024,2040,2042,2060,2200] |