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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 23 |
| 2 | 355 |
| 3 | 4595 |
| 4 | 53851 |
| 5 | 592403 |
| 6 | 6240235 |
| 7 | 63710915 |
| 8 | 635468251 |
| 9 | 6225852083 |
| 10 | 60146237515 |
| 11 | 574587484835 |
| 12 | 5439634923451 |
| 13 | 51116555484563 |
| 14 | 477406092913195 |
| 15 | 4435981769620355 |
| 16 | 41041272503703451 |
| 17 | 378327871809737843 |
| 18 | 3476703760455563275 |
| 19 | 31864966517183461475 |
[1,23,355,4595,53851,592403,6240235,63710915, 635468251,6225852083,60146237515,574587484835, 5439634923451,51116555484563,477406092913195, 4435981769620355,41041272503703451, 378327871809737843,3476703760455563275, 31864966517183461475] |