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) |
|---|---|
| 0 | 7 |
| 1 | 272 |
| 2 | 22722 |
| 3 | 2227222 |
| 4 | 222272222 |
| 5 | 22222722222 |
| 6 | 2222227222222 |
| 7 | 222222272222222 |
| 8 | 22222222722222222 |
| 9 | 2222222227222222222 |
| 10 | 222222222272222222222 |
| 11 | 22222222222722222222222 |
| 12 | 2222222222227222222222222 |
| 13 | 222222222222272222222222222 |
| 14 | 22222222222222722222222222222 |
| 15 | 2222222222222227222222222222222 |