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 | 55 |
| 3 | 66 |
| 4 | 666 |
| 5 | 5565 |
| 6 | 5886 |
| 7 | 6555 |
| 8 | 866586 |
| 9 | 5656566 |
| 10 | 5566865886 |
| 11 | 58855888686 |
| 12 | 866856686865 |
| 13 | 6686866555566 |
| 14 | 56588686866855 |
| 15 | 88588558556655 |
| 16 | 555665666566566 |
| 17 | 685565588888866 |
| 18 | 656585655585666885 |
| 19 | 5866665855856865856556555656 |
| 20 | 5555555666655656666556566566566 |
| 21 | 5588888688855688866886555588568586 |