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 | 5 |
| 2 | 18 |
| 3 | 58 |
| 4 | 179 |
| 5 | 543 |
| 6 | 1636 |
| 7 | 4916 |
| 8 | 14757 |
| 9 | 44281 |
| 10 | 132854 |
| 11 | 398574 |
| 12 | 1195735 |
| 13 | 3587219 |
| 14 | 10761672 |
| 15 | 32285032 |
| 16 | 96855113 |
| 17 | 290565357 |
| 18 | 871696090 |
| 19 | 2615088290 |
| 20 | 7845264891 |
| 21 | 23535794695 |
| 22 | 70607384108 |
| 23 | 211822152348 |
| 24 | 635466457069 |