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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 8 |
| 5 | 18 |
| 6 | 39 |
| 7 | 89 |
| 8 | 195 |
| 9 | 415 |
| 10 | 865 |
| 11 | 1823 |
| 12 | 3787 |
| 13 | 7869 |
| 14 | 16230 |
| 15 | 33352 |
| 16 | 68422 |
| 17 | 140013 |
| 18 | 285991 |
| 19 | 583235 |
| 20 | 1187718 |