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 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 9 |
| 5 | 28 |
| 6 | 57 |
| 7 | 253 |
| 8 | 842 |
| 9 | 3753 |
| 10 | 10927 |
| 11 | 15014 |
| 12 | 130831 |
| 13 | 218961 |
| 14 | 967104 |
| 15 | 3767216 |
| 16 | 29715310 |
| 17 | 89923607 |
| 18 | 314897868 |
| 19 | 785059994 |