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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 16 |
| 3 | 96 |
| 4 | 256 |
| 5 | 5632 |
| 6 | 9216 |
| 7 | 184320 |
| 8 | 262144 |
| 9 | 7064576 |
| 10 | 7929856 |
| 11 | 241238016 |
| 12 | 239878144 |
| 13 | 8348401664 |
| 14 | 7223640064 |
| 15 | 281579094016 |
| 16 | 218515111936 |
| 17 | 9420583469056 |
| 18 | 6595610148864 |
| 19 | 311967317229568 |
| 20 | 199285849194496 |
| 21 | 10252542491492352 |
[4,16,96,256,5632,9216,184320,262144,7064576, 7929856,241238016,239878144,8348401664,7223640064, 281579094016,218515111936,9420583469056, 6595610148864,311967317229568,199285849194496, 10252542491492352] |