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 | 21 |
| 2 | 441 |
| 3 | 9872 |
| 4 | 220447 |
| 5 | 5247292 |
| 6 | 124278971 |
| 7 | 3113440755 |
| 8 | 77520962327 |
| 9 | 2024021927610 |