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 | 2 |
| 4 | 4 |
| 5 | 10 |
| 6 | 31 |
| 7 | 120 |
| 8 | 578 |
| 9 | 3422 |
| 10 | 24504 |
| 11 | 208833 |
| 12 | 2086777 |
| 13 | 24123293 |
| 14 | 318800755 |
| 15 | 4766262421 |
| 16 | 79874304340 |
| 17 | 1488227986802 |