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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 1750 |
| 3 | 48501 |
| 4 | 955347 |
| 5 | 16205001 |
| 6 | 251740932 |
| 7 | 3634987413 |
| 8 | 48847405083 |
| 9 | 611199661843 |
| 10 | 7140933364136 |
| 11 | 78280456105686 |
| 12 | 809842005695656 |
| 13 | 7953581118077240 |
| 14 | 74557744904209329 |
| 15 | 670158115881138987 |
[21,1750,48501,955347,16205001,251740932, 3634987413,48847405083,611199661843,7140933364136, 78280456105686,809842005695656,7953581118077240, 74557744904209329,670158115881138987] |