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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 7 |
| 3 | 19 |
| 4 | 43 |
| 5 | 127 |
| 6 | 283 |
| 7 | 659 |
| 8 | 1319 |
| 9 | 3957 |
| 10 | 9227 |
| 11 | 21599 |
| 12 | 50123 |
| 13 | 129263 |
| 14 | 258527 |
| 15 | 775581 |
| 16 | 1551163 |
| 17 | 4340087 |
| 18 | 9750239 |
| 19 | 27353747 |
| 20 | 65148847 |
| 21 | 156067127 |
| 22 | 340997113 |
| 23 | 955523423 |