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 | 8 |
| 3 | 22 |
| 4 | 53 |
| 5 | 136 |
| 6 | 312 |
| 7 | 768 |
| 8 | 1712 |
| 9 | 4101 |
| 10 | 8971 |
| 11 | 21082 |
| 12 | 45507 |
| 13 | 105435 |
| 14 | 225347 |
| 15 | 516424 |
| 16 | 1095353 |
| 17 | 2488480 |
| 18 | 5246176 |
| 19 | 11834584 |
| 20 | 24826412 |
| 21 | 55677436 |
| 22 | 116321132 |
| 23 | 259585768 |
| 24 | 540454158 |
| 25 | 1201026646 |
| 26 | 2493149402 |
| 27 | 5520322840 |
| 28 | 11430160964 |