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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 11 |
| 4 | 20 |
| 5 | 21 |
| 6 | 16400 |
| 7 | 16401 |
| 8 | 16410 |
| 9 | 16411 |
| 10 | 16420 |
| 11 | 16421 |
| 12 | 16300 |
| 13 | 16301 |
| 14 | 16310 |
| 15 | 16311 |
| 16 | 16320 |
| 17 | 16321 |
| 18 | 16200 |
| 19 | 16201 |
| 20 | 16210 |
| 21 | 16211 |
| 22 | 16220 |
| 23 | 16221 |
| 24 | 16100 |
| 25 | 16101 |
| 26 | 16110 |
| 27 | 16111 |
| 28 | 16120 |
| 29 | 16121 |
| 30 | 16000 |
| 31 | 16001 |
| 32 | 16010 |
| 33 | 16011 |
| 34 | 16020 |
| 35 | 16021 |
| 36 | 15400 |
[1,10,11,20,21,16400,16401,16410,16411,16420, 16421,16300,16301,16310,16311,16320,16321,16200, 16201,16210,16211,16220,16221,16100,16101,16110, 16111,16120,16121,16000,16001,16010,16011,16020, 16021,15400] |