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 | 6006 |
| 2 | 8778 |
| 3 | 20202 |
| 4 | 28182 |
| 5 | 41514 |
| 6 | 43134 |
| 7 | 50505 |
| 8 | 68586 |
| 9 | 87978 |
| 10 | 111111 |
| 11 | 141141 |
| 12 | 168861 |
| 13 | 202202 |
| 14 | 204402 |
| 15 | 209902 |
| 16 | 246642 |
| 17 | 249942 |
| 18 | 262262 |
| 19 | 266662 |
| 20 | 303303 |
| 21 | 323323 |
| 22 | 393393 |
| 23 | 399993 |
| 24 | 438834 |
| 25 | 454454 |
| 26 | 505505 |
| 27 | 507705 |
| 28 | 515515 |
| 29 | 516615 |
| 30 | 519915 |
| 31 | 534435 |
| 32 | 535535 |
| 33 | 543345 |