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 | 227 |
| 2 | 37 |
| 3 | 557 |
| 4 | 0 |
| 5 | 11117 |
| 6 | 137 |
| 7 | 17171717171717171717171717171717171717171717171717177 |
| 8 | 197 |
| 9 | 23232323232323237 |
| 10 | 29297 |
| 11 | 317 |
| 12 | 0 |
| 13 | 41414141414141414141414141414141414141414141417 |