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 | 25 |
| 2 | 49 |
| 3 | 289 |
| 4 | 961 |
| 5 | 4225 |
| 6 | 16129 |
| 7 | 66049 |
| 8 | 261121 |
| 9 | 1050625 |
| 10 | 4190209 |
| 11 | 16785409 |
| 12 | 67092481 |
| 13 | 268468225 |
| 14 | 1073676289 |
| 15 | 4295098369 |
| 16 | 17179607041 |
| 17 | 68720001025 |
| 18 | 274876858369 |
| 19 | 1099513724929 |
| 20 | 4398042316801 |
| 21 | 17592194433025 |
| 22 | 70368727400449 |