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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 12 |
| 2 | 1236 |
| 3 | 4215840 |
| 4 | 274888655360 |
| 5 | 288230395747516416 |
| 6 | 4835703278617945885900800 |
| 7 | 1298074214633711825063417305104384 |
| 8 | 5575186299632655786027352001453113896599552 |
| 9 | 383123885216472214589587083913232677066440014825521152 |
[2,12,1236,4215840,274888655360, 288230395747516416,4835703278617945885900800, 1298074214633711825063417305104384, 5575186299632655786027352001453113896599552, 38312388521647221458958708391323267706644001482552\ 1152] |