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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 43 |
| 4 | 307 |
| 5 | 463 |
| 6 | 10201 |
| 7 | 24121 |
| 8 | 88453 |
| 9 | 1503743 |
| 10 | 28571327 |
| 11 | 680271 |
| 12 | 54761843 |
| 13 | 156462429 |
| 14 | 111170677 |
| 15 | 245020174253 |
| 16 | 7595625419003 |
| 17 | 2531875141141 |
| 18 | 17723125990639 |
| 19 | 655755661678837 |
| 20 | 655755661685297 |
| 21 | 867289746102097 |
[1,4,43,307,463,10201,24121,88453,1503743, 28571327,680271,54761843,156462429,111170677, 245020174253,7595625419003,2531875141141, 17723125990639,655755661678837,655755661685297, 867289746102097] |