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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 1702 |
| 4 | 63097722 |
| 5 | 623372476627154 |
| 6 | 2670179107513625597282318 |
| 7 | 7363615751879726008424500256018442794 |
| 8 | 18165723935734974232438957032838329596079311234990642 |
[1,2,8,1702,63097722,623372476627154, 2670179107513625597282318, 7363615751879726008424500256018442794, 18165723935734974232438957032838329596079311234990\ 642] |