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 | 21821 |
| 2 | 21839 |
| 3 | 21841 |
| 4 | 21851 |
| 5 | 21859 |
| 6 | 21863 |
| 7 | 21871 |
| 8 | 21881 |
| 9 | 21893 |