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 | 4 |
| 2 | 24 |
| 3 | 448 |
| 4 | 29152 |
| 5 | 6448000 |
| 6 | 4799359488 |
| 7 | 12099984537600 |
| 8 | 104875315518635520 |
| 9 | 3178565207840143938560 |
| 10 | 342288453932192597037125632 |
| 11 | 132776310046929259464457969090560 |