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 | 112 |
| 2 | 7896 |
| 3 | 453056 |
| 4 | 23232176 |
| 5 | 1113673728 |
| 6 | 51155215360 |
| 7 | 2284897159168 |
| 8 | 100157064553728 |
| 9 | 4334351404617728 |
| 10 | 185915811851773952 |
| 11 | 7925465707325177856 |
| 12 | 336395829865869340672 |
| 13 | 14234737653310804590592 |