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 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 16 |
| 6 | 77 |
| 7 | 145 |
| 8 | 668 |
| 9 | 1345 |
| 10 | 6677 |
| 11 | 13444 |
| 12 | 55778 |
| 13 | 133345 |
| 14 | 666677 |
| 15 | 1333444 |
| 16 | 5567777 |
| 17 | 12333445 |
| 18 | 66666677 |
| 19 | 133333444 |
| 20 | 556667777 |
| 21 | 1233334444 |
| 22 | 5566667777 |
| 23 | 12333334444 |
| 24 | 55666667777 |
| 25 | 123333334444 |
| 26 | 556666667777 |
| 27 | 1233333334444 |
| 28 | 5566666667777 |
| 29 | 12333333334444 |