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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 18 |
| 5 | 44 |
| 6 | 112 |
| 7 | 260 |
| 8 | 600 |
| 9 | 1346 |
| 10 | 3064 |
| 11 | 6784 |
| 12 | 15020 |
| 13 | 32812 |
| 14 | 71328 |
| 15 | 154320 |
| 16 | 332026 |
| 17 | 711500 |
| 18 | 1518384 |
| 19 | 3229044 |
| 20 | 6843256 |
| 21 | 14464760 |
| 22 | 30487496 |
| 23 | 64112960 |
| 24 | 134515472 |
| 25 | 281671698 |
| 26 | 588680628 |
| 27 | 1228211140 |
| 28 | 2558366188 |
| 29 | 5321151540 |
| 30 | 11052034932 |
| 31 | 22925310868 |