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 | 6 |
| 2 | 666 |
| 3 | 5656566 |
| 4 | 555665666566566 |
| 5 | 5555555666655656666556566566566 |
| 6 | 555555555555555666666665555665666666666555566566666556566566566 |