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) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 10 |
| 4 | 41 |
| 5 | 154 |
| 6 | 562 |
| 7 | 2023 |
| 8 | 7240 |
| 9 | 25842 |
| 10 | 92129 |
| 11 | 328270 |
| 12 | 1169390 |
| 13 | 4165231 |
| 14 | 14835316 |
| 15 | 52837774 |
| 16 | 188186161 |
| 17 | 670237602 |
| 18 | 2387090906 |
| 19 | 8501757271 |
| 20 | 30279468752 |
| 21 | 107841945274 |
| 22 | 384084812929 |
| 23 | 1367938393414 |
| 24 | 4871984909782 |
| 25 | 17351831683935 |
| 26 | 61799465142812 |
| 27 | 220102059235510 |