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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 441 |
| 3 | 5357 |
| 4 | 59812 |
| 5 | 607043 |
| 6 | 5963040 |
| 7 | 57268342 |
| 8 | 544455870 |
| 9 | 5145953202 |
| 10 | 48496979643 |
| 11 | 456336864550 |
| 12 | 4290529415423 |
| 13 | 40323106384871 |
| 14 | 378881102825949 |
| 15 | 3559611742043731 |
| 16 | 33440802573235066 |
| 17 | 314150208927203377 |
[21,441,5357,59812,607043,5963040,57268342, 544455870,5145953202,48496979643,456336864550, 4290529415423,40323106384871,378881102825949, 3559611742043731,33440802573235066, 314150208927203377] |