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 | 1 |
| 2 | 21 |
| 3 | 33 |
| 4 | 45 |
| 5 | 73 |
| 6 | 81 |
| 7 | 193 |
| 8 | 201 |
| 9 | 241 |
| 10 | 273 |
| 11 | 313 |
| 12 | 381 |
| 13 | 421 |
| 14 | 445 |
| 15 | 453 |
| 16 | 661 |
| 17 | 693 |
| 18 | 861 |
| 19 | 885 |
| 20 | 913 |