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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 17 |
| 5 | 43 |
| 6 | 109 |
| 7 | 279 |
| 8 | 721 |
| 9 | 1871 |
| 10 | 4881 |
| 11 | 12783 |
| 12 | 33585 |
| 13 | 88495 |
| 14 | 233745 |
| 15 | 618719 |
| 16 | 1640833 |
| 17 | 4358719 |
| 18 | 11595841 |
| 19 | 30890751 |
| 20 | 82391297 |
| 21 | 219995007 |
| 22 | 588004737 |
| 23 | 1573072383 |
| 24 | 4211960065 |
| 25 | 11286490879 |
| 26 | 30265474305 |