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 | 3 |
| 2 | 33 |
| 3 | 363 |
| 4 | 36663 |
| 5 | 36699663 |
| 6 | 36699699699663 |
| 7 | 2363336999698969996333632 |