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 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 5 |
| 7 | 13 |
| 8 | 27 |
| 9 | 67 |
| 10 | 157 |
| 11 | 390 |
| 12 | 963 |
| 13 | 2437 |
| 14 | 6186 |
| 15 | 15908 |
| 16 | 41127 |
| 17 | 107148 |
| 18 | 280569 |
| 19 | 738675 |
| 20 | 1953054 |
| 21 | 5185364 |
| 22 | 13816018 |
| 23 | 36934431 |
| 24 | 99030038 |
| 25 | 266254593 |
| 26 | 717652816 |
| 27 | 1938831589 |
| 28 | 5249221790 |
| 29 | 14240130827 |
| 30 | 38702218134 |
| 31 | 105367669062 |