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 | 3 |
| 1 | 5 |
| 2 | 17 |
| 3 | 257 |
| 4 | 35567 |
| 5 | 2244677999 |
| 6 | 111344445566777789 |
| 7 | 111222233333334444445666666777788899 |
| 8 | 111111222223333333344444455555555566666666777777778888888999999999999 |