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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 26 |
| 3 | 49 |
| 4 | 1651 |
| 5 | 44311 |
| 6 | 38141 |
| 7 | 45901 |
| 8 | 990681 |
| 9 | 8041777 |
| 10 | 60558487 |
| 11 | 8252802091 |
| 12 | 1348187591 |
| 13 | 11280376871 |
| 14 | 49455591538 |
| 15 | 1658081357516741 |
| 16 | 15268848817955861 |
| 17 | 6791980801494070261 |
| 18 | 8278821177559776598 |
| 19 | 759117158185214871379 |
| 20 | 47088657278621730593201 |
| 21 | 187491222710962870446779 |
[4,26,49,1651,44311,38141,45901,990681,8041777, 60558487,8252802091,1348187591,11280376871, 49455591538,1658081357516741,15268848817955861, 6791980801494070261,8278821177559776598, 759117158185214871379,47088657278621730593201, 187491222710962870446779] |