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 | 12 |
| 3 | 44 |
| 4 | 166 |
| 5 | 626 |
| 6 | 2377 |
| 7 | 9063 |
| 8 | 34695 |
| 9 | 133265 |
| 10 | 513381 |
| 11 | 1982763 |
| 12 | 7674937 |
| 13 | 29767223 |
| 14 | 115655452 |
| 15 | 450067268 |
| 16 | 1753894162 |
| 17 | 6843602438 |
| 18 | 26734398172 |
| 19 | 104548010228 |
| 20 | 409243597192 |
| 21 | 1603372802888 |
| 22 | 6286998311062 |
| 23 | 24670701224714 |
| 24 | 96877958811586 |
| 25 | 380673221064366 |