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) |
|---|---|
| 2 | 20 |
| 3 | 491 |
| 4 | 7502 |
| 5 | 52013 |
| 6 | 297464 |
| 7 | 1119791 |
| 8 | 3900890 |
| 9 | 11135201 |
| 10 | 29329232 |