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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 485 |
| 3 | 15644 |
| 4 | 417298 |
| 5 | 10928292 |
| 6 | 296647240 |
| 7 | 8028429092 |
| 8 | 216093538039 |
| 9 | 5824887373442 |
| 10 | 157116139854017 |
| 11 | 4236458479008102 |
| 12 | 114226125421270745 |
| 13 | 3080023255353736892 |
| 14 | 83050203150277226101 |
| 15 | 2239360680062968080067 |
[21,485,15644,417298,10928292,296647240, 8028429092,216093538039,5824887373442, 157116139854017,4236458479008102, 114226125421270745,3080023255353736892, 83050203150277226101,2239360680062968080067] |