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 | 81 |
| 3 | 11881 |
| 4 | 88118818815155881 |
| 5 | 18851515118581858155155881 |
| 6 | 11555185818155188818511188881585888881 |
| 7 | 5818888111118115811551585855811558551185881 |