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 | 45 |
| 2 | 2223 |
| 3 | 2728 |
| 4 | 4950 |
| 5 | 148149 |
| 6 | 351352 |
| 7 | 499500 |
| 8 | 11111112 |
| 9 | 38883889 |
| 10 | 49995000 |
| 11 | 63636364 |
| 12 | 74747475 |
| 13 | 75247525 |
| 14 | 86358636 |
| 15 | 4756047561 |
| 16 | 4999950000 |
| 17 | 5867158672 |
| 18 | 6111061111 |
| 19 | 8888888889 |
| 20 | 9132791328 |
| 21 | 104247104248 |
| 22 | 164983164984 |
| 23 | 178321178322 |
| 24 | 195156195157 |
| 25 | 230769230770 |
| 26 | 269230269231 |