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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 4 |
| 6 | 15 |
| 7 | 35 |
| 8 | 77 |
| 9 | 226 |
| 10 | 1003 |
| 11 | 4627 |
| 12 | 22195 |
| 13 | 107764 |
| 14 | 553107 |
| 15 | 3219398 |
| 16 | 20940662 |
| 17 | 146173751 |
| 18 | 1077052928 |