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) |
|---|---|
| 1 | 7 |
| 2 | 156 |
| 3 | 7581 |
| 4 | 656208 |
| 5 | 89536707 |
| 6 | 17762943744 |
| 7 | 4839641971353 |
| 8 | 1735971516115200 |
| 9 | 793577924924099679 |
| 10 | 450587906648152326144 |
| 11 | 311210374980947172777333 |
| 12 | 256996405562850515826561024 |