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 | 131 |
| 2 | 233 |
| 3 | 34459553 |
| 4 | 654729203 |
| 5 | 191898783962510753 |
| 6 | 563862029680583509947947003 |
| 7 | 2980227913743310874726229193922003 |