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 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 2 |
| 6 | 4 |
| 7 | 8 |
| 8 | 12 |
| 9 | 21 |
| 10 | 40 |
| 11 | 69 |
| 12 | 122 |
| 13 | 227 |
| 14 | 412 |
| 15 | 747 |
| 16 | 1386 |
| 17 | 2567 |
| 18 | 4744 |
| 19 | 8851 |
| 20 | 16566 |
| 21 | 31004 |
| 22 | 58268 |
| 23 | 109858 |
| 24 | 207368 |
| 25 | 392331 |
| 26 | 744072 |
| 27 | 1413291 |
| 28 | 2688822 |
| 29 | 5124738 |
| 30 | 9781492 |
| 31 | 18694896 |
| 32 | 35780444 |
| 33 | 68566567 |
| 34 | 131546440 |
| 35 | 252661515 |
| 36 | 485806614 |
| 37 | 935017790 |
| 38 | 1801327884 |
| 39 | 3473467328 |
| 40 | 6703610548 |