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 | 12 |
| 3 | 456 |
| 4 | 415416 |
| 5 | 194191194192 |
| 6 | 3816727961538167279616 |
| 7 | 35270249819024056401913527024981902405640192 |