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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 81 |
| 3 | 676 |
| 4 | 8281 |
| 5 | 72900 |
| 6 | 819025 |
| 7 | 21609 |
| 8 | 3644281 |
| 9 | 59845696 |
| 10 | 796707076 |
| 11 | 2113884529 |
| 12 | 736205184576 |
| 13 | 1751509314916 |
| 14 | 1751509314916 |
| 15 | 5176216516900 |
| 16 | 4737309139140769 |
| 17 | 99398242392417424 |
| 18 | 887828157705424896 |
| 19 | 8576326547254681744 |
| 20 | 2583667059970281481 |
[1,81,676,8281,72900,819025,21609,3644281, 59845696,796707076,2113884529,736205184576, 1751509314916,1751509314916,5176216516900, 4737309139140769,99398242392417424, 887828157705424896,8576326547254681744, 2583667059970281481] |