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 | 7 |
| 2 | 43 |
| 3 | 4003 |
| 4 | 40000003 |
| 5 | 40000000003 |
| 6 | 40000000000000000000000000000000000000003 |