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 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 2 |
| 10 | 4 |
| 11 | 7 |
| 12 | 14 |
| 13 | 28 |
| 14 | 56 |
| 15 | 112 |
| 16 | 224 |
| 17 | 447 |
| 18 | 892 |
| 19 | 1780 |
| 20 | 3553 |
| 21 | 7092 |
| 22 | 14156 |
| 23 | 28256 |
| 24 | 56400 |
| 25 | 112576 |
| 26 | 224705 |
| 27 | 448518 |
| 28 | 895256 |
| 29 | 1786959 |
| 30 | 3566826 |
| 31 | 7119496 |
| 32 | 14210736 |
| 33 | 28365072 |
| 34 | 56617568 |
| 35 | 113010431 |
| 36 | 225572344 |
| 37 | 450249432 |
| 38 | 898711905 |
| 39 | 1793856984 |