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 | 27 |
| 3 | 627 |
| 4 | 390627 |
| 5 | 152587890627 |
| 6 | 23283064365386962890627 |
| 7 | 542101086242752217003726400434970855712890627 |