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 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 26 |
| 5 | 91 |
| 6 | 302 |
| 7 | 967 |
| 8 | 3026 |
| 9 | 9331 |
| 10 | 28502 |
| 11 | 86527 |
| 12 | 261626 |
| 13 | 788971 |
| 14 | 2375102 |
| 15 | 7141687 |
| 16 | 21457826 |
| 17 | 64439011 |
| 18 | 193448102 |
| 19 | 580606447 |
| 20 | 1742343626 |
| 21 | 5228079451 |
| 22 | 15686335502 |
| 23 | 47063200807 |
| 24 | 141197991026 |
| 25 | 423610750291 |
| 26 | 1270865805302 |
| 27 | 3812664524767 |
| 28 | 11438127792026 |