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 | 3 |
| 2 | 53 |
| 3 | 1153 |
| 4 | 311153 |
| 5 | 101311153 |
| 6 | 271101311153 |
| 7 | 347271101311153 |
| 8 | 631347271101311153 |
| 9 | 719631347271101311153 |
| 10 | 829719631347271101311153 |
| 11 | 1031829719631347271101311153 |
| 12 | 11231031829719631347271101311153 |
| 13 | 125911231031829719631347271101311153 |
| 14 | 1801125911231031829719631347271101311153 |