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 | 11 |
| 2 | 11311 |
| 3 | 11411 |
| 4 | 13331 |
| 5 | 15551 |
| 6 | 16661 |
| 7 | 19991 |
| 8 | 33533 |
| 9 | 72227 |
| 10 | 75557 |
| 11 | 76667 |
| 12 | 77377 |
| 13 | 77477 |
| 14 | 77977 |
| 15 | 78887 |
| 16 | 79997 |
| 17 | 1003001 |
| 18 | 1008001 |
| 19 | 1022201 |
| 20 | 1055501 |
| 21 | 1114111 |
| 22 | 1117111 |
| 23 | 1120211 |
| 24 | 1123211 |
| 25 | 1126211 |
| 26 | 1129211 |
| 27 | 1134311 |
| 28 | 1145411 |
| 29 | 1150511 |