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 | 3 |
| 3 | 11 |
| 4 | 257 |
| 5 | 10409849 |
| 6 | 13140065160047459074769 |
| 7 | 21553582667127297807356246702227694881720251470055162138373632739283194220056118692942769 |