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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 17 |
| 4 | 107 |
| 5 | 1943 |
| 6 | 209951 |
| 7 | 408146687 |
| 8 | 85691213438975 |
| 9 | 34974584955819144511487 |
| 10 | 2997014624388697307377363936018956287 |
| 11 | 104819342594514896999066634490728502944926883876041385836543 |
[1,2,5,17,107,1943,209951,408146687, 85691213438975,34974584955819144511487, 2997014624388697307377363936018956287, 10481934259451489699906663449072850294492688387604\ 1385836543] |