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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 12 |
| 3 | 576 |
| 4 | 414720 |
| 5 | 7166361600 |
| 6 | 4334215495680000 |
| 7 | 125824009525788672000000 |
| 8 | 230121443546659694208614400000000 |
| 9 | 33669808475874225917238947767910400000000000 |
| 10 | 487707458060712424140716248549520230160793600000000000000 |
[1,2,12,576,414720,7166361600,4334215495680000, 125824009525788672000000, 230121443546659694208614400000000, 33669808475874225917238947767910400000000000, 48770745806071242414071624854952023016079360000000\ 0000000] |