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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 21 |
| 3 | 51 |
| 4 | 6321 |
| 5 | 8421 |
| 6 | 931 |
| 7 | 10521 |
| 8 | 111 |
| 9 | 1264321 |
| 10 | 14721 |
| 11 | 15531 |
| 12 | 168421 |
| 13 | 171 |
| 14 | 1896321 |
| 15 | 20105421 |
| 16 | 21731 |
| 17 | 221121 |
| 18 | 231 |
| 19 | 2412864321 |
| 20 | 261321 |
| 21 | 27931 |
| 22 | 28147421 |
| 23 | 291 |
| 24 | 30151065321 |
| 25 | 32168421 |
| 26 | 331131 |
| 27 | 341721 |
| 28 | 35751 |
| 29 | 361812964321 |
| 30 | 371 |
[1,21,51,6321,8421,931,10521,111,1264321,14721, 15531,168421,171,1896321,20105421,21731,221121, 231,2412864321,261321,27931,28147421,291, 30151065321,32168421,331131,341721,35751, 361812964321,371] |