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 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 88 |
| 5 | 252 |
| 6 | 2772 |
| 7 | 82728 |
| 8 | 2112 |
| 9 | 4224 |
| 10 | 8448 |
| 11 | 236989632 |
| 12 | 48384 |
| 13 | 2977792 |