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 | 0 |
| 1 | 3 |
| 2 | 9 |
| 3 | 84 |
| 4 | 4041 |
| 5 | 5673648 |
| 6 | 48020423368761 |
| 7 | 806086788756824484462571572 |
| 8 | 221815145293562950532110825781341443907408910699844537 |