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 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 36 |
| 5 | 66 |
| 6 | 136 |
| 7 | 666 |
| 8 | 13366 |
| 9 | 333336 |
| 10 | 6631661361 |
| 11 | 113113613161 |
| 12 | 663363661366 |
| 13 | 16116313316131 |
| 14 | 633161111666331 |
| 15 | 633613661136316 |
| 16 | 1331116613613361 |
| 17 | 33311633636366361 |
| 18 | 663661636336331361 |
| 19 | 61163111131316636331 |
| 20 | 6313111611636313666666 |
| 21 | 1616111661666616161331131 |