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| n | a(n) |
|---|---|
| 0 | 81 |
| 1 | 28561 |
| 2 | 279841 |
| 3 | 1185921 |
| 4 | 3418801 |
| 5 | 7890481 |
| 6 | 15752961 |
| 7 | 28398241 |
| 8 | 47458321 |
| 9 | 74805201 |
| 10 | 112550881 |
| 11 | 163047361 |
| 12 | 228886641 |
| 13 | 312900721 |
| 14 | 418161601 |
| 15 | 547981281 |
| 16 | 705911761 |
| 17 | 895745041 |
| 18 | 1121513121 |
| 19 | 1387488001 |
[81,28561,279841,1185921,3418801,7890481,15752961, 28398241,47458321,74805201,112550881,163047361, 228886641,312900721,418161601,547981281,705911761, 895745041,1121513121,1387488001] |