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 | 0 |
| 2 | 3 |
| 3 | 978 |
| 4 | 56630832 |
| 5 | 813802235250650 |
| 6 | 4797611106478930201025520 |
| 7 | 17327898558894838031017212608777367670 |
| 8 | 53493753018329066207577438898229132113128344235601408 |