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 | 7 |
| 2 | 67 |
| 3 | 677 |
| 4 | 67777 |
| 5 | 76667 |
| 6 | 76777 |
| 7 | 666667 |
| 8 | 677767 |
| 9 | 767677 |
| 10 | 777677 |
| 11 | 6676667 |
| 12 | 6676777 |
| 13 | 6677677 |
| 14 | 6677767 |
| 15 | 6677777 |
| 16 | 6766667 |
| 17 | 6766777 |
| 18 | 6776677 |
| 19 | 7666667 |
| 20 | 7667677 |
| 21 | 7667767 |
| 22 | 7766767 |
| 23 | 7766777 |
| 24 | 7777667 |
| 25 | 66666667 |
| 26 | 66677777 |
| 27 | 66776777 |
| 28 | 67667777 |
| 29 | 67766767 |
| 30 | 67776677 |
| 31 | 67776767 |