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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 32 |
| 4 | 1249 |
| 5 | 5986000 |
| 6 | 438522193400489 |
| 7 | 3126430743599145840898147625516 |
| 8 | 10008815260914521335142941393259537613217919681721512170785592 |
[1,2,5,32,1249,5986000,438522193400489, 3126430743599145840898147625516, 10008815260914521335142941393259537613217919681721\ 512170785592] |