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) |
|---|---|
| 2 | 73 |
| 3 | 733 |
| 4 | 7757 |
| 5 | 77557 |
| 6 | 777373 |
| 7 | 7777573 |
| 8 | 77757553 |
| 9 | 777777373 |
| 10 | 7777777237 |
| 11 | 77777773537 |
| 12 | 777777777773 |
| 13 | 7777777777573 |
| 14 | 77777777772257 |
| 15 | 777777777752557 |
| 16 | 7777777777752757 |
| 17 | 77777777777753233 |
| 18 | 777777777777753553 |