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 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 0 |
| 7 | 1 |
| 8 | 2 |
| 9 | 4 |
| 10 | 8 |
| 11 | 16 |
| 12 | 31 |
| 13 | 62 |
| 14 | 124 |
| 15 | 247 |
| 16 | 492 |
| 17 | 980 |
| 18 | 1952 |
| 19 | 3888 |
| 20 | 7745 |
| 21 | 15428 |
| 22 | 30732 |
| 23 | 61217 |
| 24 | 121942 |
| 25 | 242904 |
| 26 | 483856 |
| 27 | 963824 |
| 28 | 1919903 |
| 29 | 3824378 |
| 30 | 7618024 |
| 31 | 15174831 |
| 32 | 30227720 |
| 33 | 60212536 |
| 34 | 119941216 |
| 35 | 238918608 |
| 36 | 475917313 |
| 37 | 948010248 |
| 38 | 1888402472 |
| 39 | 3761630113 |