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 | 4 |
| 2 | 4 |
| 3 | 16 |
| 4 | 121 |
| 5 | 841 |
| 6 | 1681 |
| 7 | 28561 |
| 8 | 1256641 |
| 9 | 66601921 |
| 10 | 67334541121 |
| 11 | 489048684783785281 |
| 12 | 13573985927350210047691125121 |
| 13 | 145428587993834208572289541475484929400094613761 |