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 | 37 |
| 3 | 137 |
| 4 | 9137 |
| 5 | 29137 |
| 6 | 629137 |
| 7 | 7629137 |
| 8 | 67629137 |
| 9 | 567629137 |
| 10 | 6567629137 |
| 11 | 16567629137 |
| 12 | 216567629137 |
| 13 | 6216567629137 |
| 14 | 46216567629137 |
| 15 | 646216567629137 |
| 16 | 2646216567629137 |
| 17 | 12646216567629137 |
| 18 | 312646216567629137 |
| 19 | 6312646216567629137 |
| 20 | 86312646216567629137 |