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 | 406 |
| 4 | 666 |
| 5 | 66066 |
| 6 | 446040 |
| 7 | 600060 |
| 8 | 46046406 |
| 9 | 440466040 |
| 10 | 4040600460 |
| 11 | 6604444400406 |
| 12 | 4440066066400004040 |
| 13 | 644006046066000066046 |
| 14 | 44464646466606404046664666 |
| 15 | 464440406444064040044646006604604066 |
| 16 | 660466006640066446666000606004066646 |
| 17 | 60404640400640406040004460664400044060 |