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 | 12 |
| 3 | 1475 |
| 4 | 1966284 |
| 5 | 28792327202 |
| 6 | 4637090716230072 |
| 7 | 8214898341126993790759 |
| 8 | 160085145151052208703206236460 |
| 9 | 34315672899472590258644379240786601502 |