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) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 225 |
| 3 | 5625 |
| 4 | 140625 |
| 5 | 3515625 |
| 6 | 87890625 |
| 7 | 2197265625 |
| 8 | 54931640625 |
| 9 | 1373291015625 |
| 10 | 34332275390625 |
| 11 | 858306884765625 |
| 12 | 21457672119140625 |
| 13 | 536441802978515625 |
| 14 | 13411045074462890625 |
| 15 | 335276126861572265625 |
| 16 | 8381903171539306640625 |
| 17 | 209547579288482666015625 |
| 18 | 5238689482212066650390625 |