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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 26 |
| 3 | 2506 |
| 4 | 624446 |
| 5 | 322530466 |
| 6 | 301458657626 |
| 7 | 465560613932206 |
| 8 | 1112284734271280846 |
[1,26,2506,624446,322530466,301458657626, 465560613932206,1112284734271280846] |