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A068671 as a simple table
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 21 |
| 3 | 31 |
| 4 | 421 |
| 5 | 521 |
| 6 | 6321 |
| 7 | 7321 |
| 8 | 84221 |
| 9 | 94321 |
| 10 | 1053221 |
| 11 | 1153221 |
| 12 | 12643221 |
| 13 | 13643221 |
| 14 | 147432221 |
| 15 | 157533221 |
| 16 | 1685432221 |
| 17 | 1785432221 |
| 18 | 18964332221 |
| 19 | 19964332221 |
| 20 | 2010654322221 |
| 21 | 2110754332221 |
| 22 | 22117543322221 |
| 23 | 23117543322221 |
[1,21,31,421,521,6321,7321,84221,94321,1053221, 1153221,12643221,13643221,147432221,157533221, 1685432221,1785432221,18964332221,19964332221, 2010654322221,2110754332221,22117543322221, 23117543322221] |