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 | 10123457689 |
| 2 | 10123465789 |
| 3 | 10123465897 |
| 4 | 10123485679 |
| 5 | 10123485769 |
| 6 | 10123496857 |
| 7 | 10123547869 |
| 8 | 10123548679 |
| 9 | 10123568947 |
| 10 | 10123578649 |
| 11 | 10123586947 |
| 12 | 10123598467 |
| 13 | 10123654789 |
| 14 | 10123684759 |
| 15 | 10123685749 |
| 16 | 10123694857 |
| 17 | 10123746859 |
| 18 | 10123784569 |
| 19 | 10123846597 |
| 20 | 10123849657 |
| 21 | 10123854679 |