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 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 12 |
| 6 | 21 |
| 7 | 42 |
| 8 | 83 |
| 9 | 159 |
| 10 | 313 |
| 11 | 609 |
| 12 | 1186 |
| 13 | 2316 |
| 14 | 4512 |
| 15 | 8799 |
| 16 | 17158 |
| 17 | 33450 |
| 18 | 65225 |
| 19 | 127173 |
| 20 | 247958 |
| 21 | 483471 |
| 22 | 942660 |
| 23 | 1837989 |
| 24 | 3583691 |
| 25 | 6987429 |
| 26 | 13624009 |
| 27 | 26563920 |
| 28 | 51793996 |
| 29 | 100987296 |
| 30 | 196903761 |
| 31 | 383920500 |