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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 39 |
| 4 | 624 |
| 5 | 19999 |
| 6 | 1279936 |
| 7 | 163831935 |
| 8 | 41940975360 |
| 9 | 21473779384831 |
| 10 | 21989150090066944 |
| 11 | 45033779384457103359 |
| 12 | 184458360358736295358464 |
| 13 | 1511082888058767731576545279 |
| 14 | 24757582037954850514150117851136 |
| 15 | 811256448219704541647671061746057215 |
[1,4,39,624,19999,1279936,163831935,41940975360, 21473779384831,21989150090066944, 45033779384457103359,184458360358736295358464, 1511082888058767731576545279, 24757582037954850514150117851136, 811256448219704541647671061746057215] |