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 | 4 |
| 1 | 11 |
| 2 | 32 |
| 3 | 95 |
| 4 | 284 |
| 5 | 851 |
| 6 | 2552 |
| 7 | 7655 |
| 8 | 22964 |
| 9 | 68891 |
| 10 | 206672 |
| 11 | 620015 |
| 12 | 1860044 |
| 13 | 5580131 |
| 14 | 16740392 |
| 15 | 50221175 |
| 16 | 150663524 |
| 17 | 451990571 |
| 18 | 1355971712 |
| 19 | 4067915135 |
| 20 | 12203745404 |
| 21 | 36611236211 |
| 22 | 109833708632 |
| 23 | 329501125895 |
| 24 | 988503377684 |
| 25 | 2965510133051 |
| 26 | 8896530399152 |
| 27 | 26689591197455 |