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 | 2 |
| 2 | 7 |
| 3 | 22 |
| 4 | 27 |
| 5 | 72 |
| 6 | 77 |
| 7 | 222 |
| 8 | 227 |
| 9 | 272 |
| 10 | 277 |
| 11 | 722 |
| 12 | 727 |
| 13 | 772 |
| 14 | 777 |
| 15 | 2222 |
| 16 | 2227 |
| 17 | 2272 |
| 18 | 2277 |
| 19 | 2722 |
| 20 | 2727 |
| 21 | 2772 |
| 22 | 2777 |
| 23 | 7222 |
| 24 | 7227 |
| 25 | 7272 |
| 26 | 7277 |
| 27 | 7722 |
| 28 | 7727 |
| 29 | 7772 |
| 30 | 7777 |
| 31 | 22222 |
| 32 | 22227 |
| 33 | 22272 |
| 34 | 22277 |
| 35 | 22722 |
| 36 | 22727 |
| 37 | 22772 |
| 38 | 22777 |
| 39 | 27222 |
| 40 | 27227 |
| 41 | 27272 |
| 42 | 27277 |
| 43 | 27722 |
| 44 | 27727 |