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 | 18 |
| 4 | 215 |
| 5 | 5320 |
| 6 | 173111 |
| 7 | 8041166 |
| 8 | 483906047 |
| 9 | 37296199680 |
| 10 | 3556982106479 |
| 11 | 412503302058958 |