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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 21 |
| 3 | 2584 |
| 4 | 2178309 |
| 5 | 12586269025 |
| 6 | 498454011879264 |
| 7 | 135301852344706746049 |
| 8 | 251728825683549488150424261 |
| 9 | 3210056809456107725247980776292056 |
| 10 | 280571172992510140037611932413038677189525 |
[1,21,2584,2178309,12586269025,498454011879264, 135301852344706746049,251728825683549488150424261, 3210056809456107725247980776292056, 280571172992510140037611932413038677189525] |