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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 305 |
| 5 | 46733 |
| 6 | 1091999929 |
| 7 | 1192463845485813745 |
| 8 | 710985011395407339530814550372704577 |
| 9 | 252749843214463752223970400013115847462076218642780299149809471303529825 |
[1,5,17,305,46733,1091999929,1192463845485813745, 710985011395407339530814550372704577, 25274984321446375222397040001311584746207621864278\ 0299149809471303529825] |