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 | 409 |
| 2 | 4409 |
| 3 | 4999 |
| 4 | 6869 |
| 5 | 44699 |
| 6 | 44909 |
| 7 | 46499 |
| 8 | 48409 |
| 9 | 64849 |
| 10 | 66889 |
| 11 | 68449 |
| 12 | 68909 |
| 13 | 86969 |
| 14 | 89689 |
| 15 | 98869 |
| 16 | 98899 |
| 17 | 480499 |
| 18 | 488689 |
| 19 | 490499 |
| 20 | 609809 |
| 21 | 806609 |
| 22 | 806999 |
| 23 | 866969 |
| 24 | 868669 |
| 25 | 868849 |
| 26 | 869489 |
| 27 | 869849 |
| 28 | 869899 |
| 29 | 869909 |
| 30 | 880949 |
| 31 | 6440809 |
| 32 | 6440999 |
| 33 | 6488969 |
| 34 | 6489449 |