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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 2989 |
| 3 | 394580 |
| 4 | 51672851 |
| 5 | 6758547145 |
| 6 | 883809591160 |
| 7 | 115571009291599 |
| 8 | 15112491898694315 |
| 9 | 1976162121051496204 |
| 10 | 258409744432367037405 |
| 11 | 33790541796768618273627 |
| 12 | 4418566652828051992947794 |
[21,2989,394580,51672851,6758547145,883809591160, 115571009291599,15112491898694315, 1976162121051496204,258409744432367037405, 33790541796768618273627,4418566652828051992947794] |