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 | 10 |
| 3 | 33 |
| 4 | 98 |
| 5 | 291 |
| 6 | 826 |
| 7 | 2320 |
| 8 | 6342 |
| 9 | 17188 |
| 10 | 45750 |
| 11 | 120733 |
| 12 | 314690 |
| 13 | 813854 |
| 14 | 2085363 |
| 15 | 5306878 |
| 16 | 13406382 |
| 17 | 33665476 |
| 18 | 84031608 |
| 19 | 208655086 |
| 20 | 515469203 |
| 21 | 1267600993 |
| 22 | 3103490884 |
| 23 | 7567559622 |
| 24 | 18381579206 |
| 25 | 44487740012 |
| 26 | 107301636460 |
| 27 | 257967350824 |
| 28 | 618279370985 |