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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 720 |
| 4 | 3628800 |
| 5 | 144850083840000 |
| 6 | 272760108249915378892800000000 |
| 7 | 1264767303092594444142256488682840323816161280000000000000000 |
[1,2,12,720,3628800,144850083840000, 272760108249915378892800000000, 12647673030925944441422564886828403238161612800000\ 00000000000] |