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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 64 |
| 3 | 484 |
| 4 | 8464 |
| 5 | 88804 |
| 6 | 868624 |
| 7 | 8880400 |
| 8 | 86862400 |
| 9 | 888040000 |
| 10 | 8880800644 |
| 11 | 88864802404 |
| 12 | 888868068804 |
| 13 | 8886826042084 |
| 14 | 88886806880400 |
| 15 | 888686062262244 |
| 16 | 8888680688040000 |
| 17 | 88868606226224400 |
| 18 | 888868068804000000 |
| 19 | 8888600480200862404 |
| 20 | 88886806880400000000 |
[4,64,484,8464,88804,868624,8880400,86862400, 888040000,8880800644,88864802404,888868068804, 8886826042084,88886806880400,888686062262244, 8888680688040000,88868606226224400, 888868068804000000,8888600480200862404, 88886806880400000000] |