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) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 4 |
| 4 | 9 |
| 5 | 23 |
| 6 | 61 |
| 7 | 166 |
| 8 | 459 |
| 9 | 1284 |
| 10 | 3623 |
| 11 | 10292 |
| 12 | 29395 |
| 13 | 84327 |
| 14 | 242807 |
| 15 | 701314 |
| 16 | 2031085 |
| 17 | 5895951 |
| 18 | 17150013 |
| 19 | 49975428 |
| 20 | 145862571 |
| 21 | 426337773 |
| 22 | 1247741271 |
| 23 | 3655973226 |
| 24 | 10723668081 |
| 25 | 31485145902 |
| 26 | 92524150845 |
| 27 | 272120203908 |
| 28 | 800931753629 |
| 29 | 2359038637409 |
| 30 | 6952768502473 |