This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 81 |
| 3 | 289 |
| 4 | 1369 |
| 5 | 5929 |
| 6 | 26569 |
| 7 | 117649 |
| 8 | 522729 |
| 9 | 2319529 |
| 10 | 10297681 |
| 11 | 45711121 |
| 12 | 202920025 |
| 13 | 900780169 |
| 14 | 3998665225 |
| 15 | 17750499361 |
| 16 | 78796419849 |
| 17 | 349785896329 |
| 18 | 1552737795921 |
| 19 | 6892772417281 |
| 20 | 30597768825625 |
| 21 | 135826834143529 |