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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 7 |
| 6 | 16 |
| 7 | 33 |
| 8 | 74 |
| 9 | 155 |
| 10 | 329 |
| 11 | 688 |
| 12 | 1439 |
| 13 | 2975 |
| 14 | 6154 |
| 15 | 12654 |
| 16 | 25964 |
| 17 | 53091 |
| 18 | 108369 |
| 19 | 220643 |
| 20 | 448520 |