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| n | a(n) |
|---|---|
| 1 | 21720 |
| 2 | 308423 |
| 3 | 3433899 |
| 4 | 32439684 |
| 5 | 279055227 |
| 6 | 2247957615 |
| 7 | 17355955112 |
| 8 | 130154155397 |
| 9 | 957718964643 |
| 10 | 6961339210825 |
| 11 | 50231364173275 |
| 12 | 361033974954169 |
| 13 | 2590903481902197 |
| 14 | 18593763503880057 |
| 15 | 133579469806293855 |
[21720,308423,3433899,32439684,279055227, 2247957615,17355955112,130154155397,957718964643, 6961339210825,50231364173275,361033974954169, 2590903481902197,18593763503880057, 133579469806293855] |