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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 54 |
| 3 | 4320 |
| 4 | 2500000 |
| 5 | 5252187500 |
| 6 | 68336412238080 |
| 7 | 3507134014317846528 |
| 8 | 1039468958911770833166336 |
| 9 | 1271288794044247678785011427072 |
| 10 | 8629570422218326431392139107794299444 |
| 11 | 248662702551142788293946930136251315440514048 |
| 12 | 38763625610496798571986566181715696354290667009540096 |
[2,54,4320,2500000,5252187500,68336412238080, 3507134014317846528,1039468958911770833166336, 1271288794044247678785011427072, 8629570422218326431392139107794299444, 248662702551142788293946930136251315440514048, 38763625610496798571986566181715696354290667009540\ 096] |