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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 53 |
| 3 | 1753 |
| 4 | 753 |
| 5 | 60753 |
| 6 | 660753 |
| 7 | 9660753 |
| 8 | 99660753 |
| 9 | 899660753 |
| 10 | 3899660753 |
| 11 | 33899660753 |
| 12 | 233899660753 |
| 13 | 7233899660753 |
| 14 | 97233899660753 |
| 15 | 497233899660753 |
| 16 | 1497233899660753 |
| 17 | 31497233899660753 |
| 18 | 631497233899660753 |
| 19 | 9631497233899660753 |
| 20 | 59631497233899660753 |
| 21 | 559631497233899660753 |