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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 1104 |
| 3 | 2154304 |
| 4 | 15456463104 |
| 5 | 295213107733504 |
| 6 | 12366226074019221504 |
| 7 | 998143138923599406383104 |
| 8 | 141496025961835234723147874304 |
| 9 | 32857017298796399667445911477551104 |
| 10 | 11837460622615877064781409516336792469504 |
[1,4,1104,2154304,15456463104,295213107733504, 12366226074019221504,998143138923599406383104, 141496025961835234723147874304, 32857017298796399667445911477551104, 11837460622615877064781409516336792469504] |