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 | 1 |
| 4 | 3 |
| 5 | 7 |
| 6 | 16 |
| 7 | 34 |
| 8 | 70 |
| 9 | 143 |
| 10 | 289 |
| 11 | 581 |
| 12 | 1166 |
| 13 | 2336 |
| 14 | 4676 |
| 15 | 9357 |
| 16 | 18719 |
| 17 | 37443 |
| 18 | 74892 |
| 19 | 149790 |
| 20 | 299586 |
| 21 | 599179 |
| 22 | 1198365 |
| 23 | 2396737 |
| 24 | 4793482 |
| 25 | 9586972 |
| 26 | 19173952 |
| 27 | 38347913 |
| 28 | 76695835 |
| 29 | 153391679 |
| 30 | 306783368 |
| 31 | 613566746 |
| 32 | 1227133502 |