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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 19 |
| 3 | 1519 |
| 4 | 426359 |
| 5 | 515473927 |
| 6 | 2519813048575 |
| 7 | 51596648899152901 |
| 8 | 4382197669772597921079 |
| 9 | 1555039484181265199709474223 |
| 10 | 2303272223887812126256525632339813 |
[1,19,1519,426359,515473927,2519813048575, 51596648899152901,4382197669772597921079, 1555039484181265199709474223, 2303272223887812126256525632339813] |