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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 289 |
| 3 | 593 |
| 4 | 16008 |
| 5 | 464357 |
| 6 | 12414382 |
| 7 | 526480617 |
| 8 | 21681685596 |
| 9 | 800622189621 |
| 10 | 32130855052281 |
| 11 | 1312119008692568 |
| 12 | 51836224178847872 |
| 13 | 2071718430619769621 |
| 14 | 83585729339898936754 |
| 15 | 3347455884395450478055 |
| 16 | 134104196324870185800023 |
[21,289,593,16008,464357,12414382,526480617, 21681685596,800622189621,32130855052281, 1312119008692568,51836224178847872, 2071718430619769621,83585729339898936754, 3347455884395450478055,134104196324870185800023] |