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) |
|---|---|
| 2 | 89478485 |
| 3 | 1027277763840 |
| 4 | 12351638368337101 |
| 5 | 152698472130740768840 |