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| n | a(n) |
|---|---|
| 1 | 2821 |
| 2 | 488881 |
| 3 | 288120421 |
| 4 | 492559141 |
| 5 | 776176261 |
| 6 | 1632785701 |
| 7 | 3835537861 |
| 8 | 6735266161 |
| 9 | 9030158341 |
| 10 | 21796387201 |
| 11 | 167098039921 |
| 12 | 288374745541 |
| 13 | 351768558961 |
| 14 | 381558955141 |
| 15 | 505121232001 |
| 16 | 582561482161 |
| 17 | 915245066821 |
| 18 | 2199733160881 |
| 19 | 2402435763841 |
| 20 | 4541477778181 |
[2821,488881,288120421,492559141,776176261, 1632785701,3835537861,6735266161,9030158341, 21796387201,167098039921,288374745541, 351768558961,381558955141,505121232001, 582561482161,915245066821,2199733160881, 2402435763841,4541477778181] |