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 | 8 |
| 4 | 23 |
| 5 | 62 |
| 6 | 175 |
| 7 | 477 |
| 8 | 1319 |
| 9 | 3602 |
| 10 | 9851 |
| 11 | 26779 |
| 12 | 72726 |
| 13 | 196724 |
| 14 | 531157 |
| 15 | 1430144 |
| 16 | 3842911 |
| 17 | 10303055 |
| 18 | 27570786 |
| 19 | 73637306 |
| 20 | 196333303 |
| 21 | 522584286 |
| 22 | 1388786089 |
| 23 | 3685169795 |
| 24 | 9764703347 |
| 25 | 25838430572 |
| 26 | 68282175170 |
| 27 | 180221449469 |
| 28 | 475102410065 |
| 29 | 1251038486529 |