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 | 61 |
| 5 | 173 |
| 6 | 496 |
| 7 | 1428 |
| 8 | 4121 |
| 9 | 11911 |
| 10 | 34476 |
| 11 | 99942 |
| 12 | 290185 |
| 13 | 843933 |
| 14 | 2458296 |
| 15 | 7171728 |
| 16 | 20952569 |
| 17 | 61295779 |
| 18 | 179539052 |
| 19 | 526476666 |
| 20 | 1545434817 |
| 21 | 4540842657 |
| 22 | 13353733048 |
| 23 | 39302395732 |
| 24 | 115759913681 |
| 25 | 341189589287 |