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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 256 |
| 3 | 36 |
| 4 | 4096 |
| 5 | 500 |
| 6 | 82944 |
| 7 | 9604 |
| 8 | 2097152 |
| 9 | 236196 |
| 10 | 64000000 |
| 11 | 7086244 |
| 12 | 2293235712 |
| 13 | 250994068 |
| 14 | 94450499584 |
| 15 | 10251562500 |
| 16 | 4398046511104 |
| 17 | 474351505988 |
| 18 | 228509902503936 |
| 19 | 24524265031204 |
| 20 | 13107200000000000 |
[4,256,36,4096,500,82944,9604,2097152,236196, 64000000,7086244,2293235712,250994068,94450499584, 10251562500,4398046511104,474351505988, 228509902503936,24524265031204,13107200000000000] |