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) |
|---|---|
| 3 | 16 |
| 4 | 631 |
| 5 | 4989601 |
| 6 | 778377601 |
| 7 | 44460928512001 |
| 8 | 15205637551104001 |
| 9 | 3231502092360622080001 |
| 10 | 1105220249217462744317952000001 |
| 11 | 1027854831772240352215695360000001 |