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 | 1818 |
| 2 | 8181 |
| 3 | 181818 |
| 4 | 198198 |
| 5 | 405405 |
| 6 | 484848 |
| 7 | 504504 |
| 8 | 565656 |
| 9 | 576576 |
| 10 | 656565 |
| 11 | 675675 |
| 12 | 818181 |
| 13 | 848484 |
| 14 | 891891 |
| 15 | 11311131 |
| 16 | 13041304 |
| 17 | 13111311 |
| 18 | 18181818 |
| 19 | 19981998 |
| 20 | 22622262 |
| 21 | 26222622 |
| 22 | 33933393 |
| 23 | 39333933 |
| 24 | 40314031 |
| 25 | 41544154 |
| 26 | 45144514 |
| 27 | 46364636 |
| 28 | 63646364 |
| 29 | 81818181 |
| 30 | 87498749 |
| 31 | 89918991 |
| 32 | 94789478 |