| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 102 |
| 3 | 120 |
| 4 | 200 |
| 5 | 220 |
| 6 | 302 |
| 7 | 320 |
| 8 | 402 |
| 9 | 420 |
| 10 | 502 |
| 11 | 520 |
| 12 | 602 |
| 13 | 620 |
| 14 | 702 |
| 15 | 720 |
| 16 | 802 |
| 17 | 820 |
| 18 | 902 |
| 19 | 920 |
| 20 | 1002 |
| 21 | 1020 |
| 22 | 1102 |
| 23 | 1120 |
| 24 | 1200 |
| 25 | 1220 |
| 26 | 1302 |
| 27 | 1320 |
| 28 | 1402 |
| 29 | 1420 |
| 30 | 1502 |
| 31 | 1520 |
| 32 | 1602 |
| 33 | 1620 |
| 34 | 1702 |
| 35 | 1720 |
| 36 | 1802 |
| 37 | 1820 |
| 38 | 1902 |
| 39 | 1920 |
| 40 | 2000 |
| 41 | 2102 |
[20,102,120,200,220,302,320,402,420,502,520,602, 620,702,720,802,820,902,920,1002,1020,1102,1120, 1200,1220,1302,1320,1402,1420,1502,1520,1602,1620, 1702,1720,1802,1820,1902,1920,2000,2102] |