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 | 6 |
| 2 | 66 |
| 3 | 666 |
| 4 | 66066 |
| 5 | 600060 |
| 6 | 6626620 |
| 7 | 2620626606 |
| 8 | 2200022662006 |
| 9 | 626622226002066066 |
| 10 | 66006260060666006026 |
| 11 | 20066002660020662200026 |
| 12 | 222220220206620206202066 |
| 13 | 22222002022666602062066226 |
| 14 | 66222600026062602006000600 |
| 15 | 20666666202602626260022660266 |