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 | 1 |
| 2 | 9 |
| 3 | 121 |
| 4 | 1681 |
| 5 | 23409 |
| 6 | 326041 |
| 7 | 4541161 |
| 8 | 63250209 |
| 9 | 880961761 |
| 10 | 12270214441 |
| 11 | 170902040409 |
| 12 | 2380358351281 |
| 13 | 33154114877521 |
| 14 | 461777249934009 |
| 15 | 6431727384198601 |
| 16 | 89582406128846401 |
| 17 | 1247721958419651009 |
| 18 | 17378525011746267721 |
| 19 | 242051628206028097081 |