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 | 5 |
| 5 | 15 |
| 6 | 55 |
| 7 | 246 |
| 8 | 1398 |
| 9 | 10301 |
| 10 | 98532 |
| 11 | 1246479 |
| 12 | 20837171 |
| 13 | 466087624 |
| 14 | 13943041873 |
| 15 | 563753074915 |
| 16 | 30784745506212 |