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 | 0 |
| 7 | 1 |
| 8 | 2 |
| 9 | 3 |
| 10 | 6 |
| 11 | 12 |
| 12 | 24 |
| 13 | 48 |
| 14 | 96 |
| 15 | 191 |
| 16 | 380 |
| 17 | 757 |
| 18 | 1508 |
| 19 | 3004 |
| 20 | 5984 |
| 21 | 11920 |
| 22 | 23744 |
| 23 | 47297 |
| 24 | 94214 |
| 25 | 187671 |
| 26 | 373834 |
| 27 | 744664 |
| 28 | 1483344 |
| 29 | 2954768 |
| 30 | 5885792 |
| 31 | 11724287 |
| 32 | 23354360 |
| 33 | 46521049 |
| 34 | 92668264 |
| 35 | 184591864 |
| 36 | 367700384 |
| 37 | 732446000 |
| 38 | 1459006208 |
| 39 | 2906288129 |