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 | 6 |
| 3 | 66 |
| 4 | 91 |
| 5 | 666 |
| 6 | 961191 |
| 7 | 996166 |
| 8 | 1191196 |
| 9 | 96111966961 |
| 10 | 99119996661 |
| 11 | 16161696119661 |
| 12 | 196999111911966 |
| 13 | 661969169911666 |
| 14 | 11961669169169616 |
| 15 | 19961691661699161 |
| 16 | 991961666199161911 |
| 17 | 6116119911196616916 |
| 18 | 16961161696691611916961 |
| 19 | 911666691991111199916696 |