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 | 3 |
| 2 | 31 |
| 3 | 311 |
| 4 | 3119 |
| 5 | 31193 |
| 6 | 311951 |
| 7 | 3119533 |
| 8 | 31195343 |
| 9 | 311953441 |
| 10 | 3119534441 |
| 11 | 31195344413 |
| 12 | 311953444133 |
| 13 | 3119534441393 |
| 14 | 31195344413953 |
| 15 | 311953444139539 |
| 16 | 3119534441395579 |
| 17 | 31195344413955853 |
| 18 | 311953444139558593 |