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 | 9 |
| 3 | 1035 |
| 4 | 981541 |
| 5 | 4855258305 |
| 6 | 94459713879600 |
| 7 | 5945968652327831925 |
| 8 | 1046591482728407939338275 |
| 9 | 459761347800901006933211075259 |
| 10 | 460129061613105910803354676484897475 |