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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 16 |
| 3 | 324 |
| 4 | 12100 |
| 5 | 595984 |
| 6 | 35236096 |
| 7 | 2363709924 |
| 8 | 174221090404 |
| 9 | 13815880848784 |
| 10 | 1161868621405636 |
| 11 | 102544273501721104 |
| 12 | 9424551852935116804 |
| 13 | 896612457556434503824 |
| 14 | 87881363502264179831824 |
| 15 | 8840846163309028336017124 |
[4,16,324,12100,595984,35236096,2363709924, 174221090404,13815880848784,1161868621405636, 102544273501721104,9424551852935116804, 896612457556434503824,87881363502264179831824, 8840846163309028336017124] |