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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 216 |
| 4 | 20736 |
| 5 | 3200000 |
| 6 | 729000000 |
| 7 | 230539333248 |
| 8 | 96717311574016 |
| 9 | 51998697814228992 |
| 10 | 34867844010000000000 |
| 11 | 28531167061100000000000 |
| 12 | 27982542656501458535448576 |
| 13 | 32405578483833249047003529216 |
| 14 | 43752153272681450786889799450624 |
[0,4,216,20736,3200000,729000000,230539333248, 96717311574016,51998697814228992, 34867844010000000000,28531167061100000000000, 27982542656501458535448576, 32405578483833249047003529216, 43752153272681450786889799450624] |