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 | 14 |
| 2 | 2567 |
| 3 | 79544 |
| 4 | 1596800 |
| 5 | 20789082 |
| 6 | 196933710 |
| 7 | 1450606028 |
| 8 | 8719846960 |
| 9 | 44321202192 |
| 10 | 195717772000 |
| 11 | 767025716736 |
| 12 | 2713659864832 |
| 13 | 8787898861568 |