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 | 111 |
| 2 | 221 |
| 3 | 551 |
| 4 | 771 |
| 5 | 11111 |
| 6 | 14141 |
| 7 | 15151 |
| 8 | 16161 |
| 9 | 19191 |
| 10 | 23231 |
| 11 | 24241 |
| 12 | 29291 |
| 13 | 30301 |
| 14 | 34341 |
| 15 | 36361 |
| 16 | 37371 |
| 17 | 38381 |
| 18 | 39391 |
| 19 | 42421 |
| 20 | 44441 |
| 21 | 47471 |
| 22 | 50501 |
| 23 | 53531 |
| 24 | 55551 |
| 25 | 56561 |
| 26 | 59591 |
| 27 | 62621 |
| 28 | 68681 |
| 29 | 70701 |
| 30 | 74741 |
| 31 | 75751 |
| 32 | 77771 |
| 33 | 79791 |
| 34 | 81811 |
| 35 | 83831 |
| 36 | 84841 |
| 37 | 87871 |
| 38 | 91911 |
| 39 | 95951 |
| 40 | 96961 |
| 41 | 1001001 |