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 | 131 |
| 2 | 151 |
| 3 | 181 |
| 4 | 191 |
| 5 | 12421 |
| 6 | 12721 |
| 7 | 12821 |
| 8 | 13831 |
| 9 | 13931 |
| 10 | 14741 |
| 11 | 17971 |
| 12 | 1235321 |
| 13 | 1245421 |
| 14 | 1257521 |
| 15 | 1268621 |
| 16 | 1278721 |
| 17 | 1456541 |
| 18 | 1469641 |
| 19 | 1489841 |
| 20 | 1579751 |
| 21 | 1589851 |
| 22 | 123484321 |
| 23 | 123494321 |
| 24 | 123575321 |
| 25 | 136797631 |
| 26 | 167898761 |
| 27 | 12345854321 |