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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 15 |
| 4 | 63 |
| 5 | 157 |
| 6 | 633 |
| 7 | 1578 |
| 8 | 6334 |
| 9 | 15786 |
| 10 | 63344 |
| 11 | 157866 |
| 12 | 633445 |
| 13 | 1578667 |
| 14 | 6334455 |
| 15 | 15786676 |
| 16 | 63344554 |
| 17 | 157866766 |
| 18 | 633445544 |
| 19 | 1578667666 |
| 20 | 6334455446 |
| 21 | 15786676667 |
| 22 | 63344554464 |
| 23 | 157866766678 |
| 24 | 633445544643 |
| 25 | 1578667666788 |
[1,6,15,63,157,633,1578,6334,15786,63344,157866, 633445,1578667,6334455,15786676,63344554, 157866766,633445544,1578667666,6334455446, 15786676667,63344554464,157866766678,633445544643, 1578667666788] |