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 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 35 |
| 7 | 313 |
| 8 | 26261407 |
| 9 | 1001689887346 |
| 10 | 356879751557595054813966522072161803 |
| 11 | 3221974575788016845202611315068840860244866942009716269469 |