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 | 2 |
| 2 | 3 |
| 3 | 10 |
| 4 | 34 |
| 5 | 97 |
| 6 | 273 |
| 7 | 795 |
| 8 | 2324 |
| 9 | 6747 |
| 10 | 19568 |
| 11 | 56830 |
| 12 | 165089 |
| 13 | 479447 |
| 14 | 1392313 |
| 15 | 4043490 |
| 16 | 11743079 |
| 17 | 34103822 |
| 18 | 99042758 |
| 19 | 287636025 |
| 20 | 835341669 |
| 21 | 2425966747 |
| 22 | 7045397028 |
| 23 | 20460965935 |
| 24 | 59421937484 |
| 25 | 172570865722 |
| 26 | 501173551873 |
| 27 | 1455488611595 |
| 28 | 4226973059649 |