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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 36 |
| 5 | 1536 |
| 6 | 116954 |
| 7 | 27354464 |
| 8 | 16992197390 |
| 9 | 27071152148341 |
| 10 | 112124137590207769 |