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 | 45 |
| 4 | 51 |
| 5 | 81 |
| 6 | 213 |
| 7 | 249 |
| 8 | 315 |
| 9 | 477 |
| 10 | 525 |
| 11 | 681 |
| 12 | 891 |
| 13 | 1143 |
| 14 | 1221 |
| 15 | 1851 |
| 16 | 1965 |
| 17 | 2415 |
| 18 | 5133 |