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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 2 |
| 8 | 3 |
| 9 | 6 |
| 10 | 12 |
| 11 | 24 |
| 12 | 48 |
| 13 | 95 |
| 14 | 188 |
| 15 | 373 |
| 16 | 740 |
| 17 | 1468 |
| 18 | 2912 |
| 19 | 5776 |
| 20 | 11457 |
| 21 | 22726 |
| 22 | 45079 |
| 23 | 89418 |
| 24 | 177368 |
| 25 | 351824 |
| 26 | 697872 |
| 27 | 1384287 |
| 28 | 2745848 |
| 29 | 5446617 |
| 30 | 10803816 |
| 31 | 21430264 |
| 32 | 42508704 |
| 33 | 84319536 |
| 34 | 167254785 |
| 35 | 331763722 |
| 36 | 658080827 |
| 37 | 1305357838 |
| 38 | 2589285412 |