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 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 2 |
| 8 | 4 |
| 9 | 7 |
| 10 | 14 |
| 11 | 28 |
| 12 | 56 |
| 13 | 111 |
| 14 | 220 |
| 15 | 436 |
| 16 | 865 |
| 17 | 1716 |
| 18 | 3404 |
| 19 | 6752 |
| 20 | 13393 |
| 21 | 26566 |
| 22 | 52696 |
| 23 | 104527 |
| 24 | 207338 |
| 25 | 411272 |
| 26 | 815792 |
| 27 | 1618191 |
| 28 | 3209816 |
| 29 | 6366936 |
| 30 | 12629345 |
| 31 | 25051352 |
| 32 | 49691432 |
| 33 | 98567072 |
| 34 | 195515953 |
| 35 | 387822090 |
| 36 | 769277244 |
| 37 | 1525925143 |
| 38 | 3026798934 |