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 | 2 |
| 2 | 7 |
| 3 | 13 |
| 4 | 149 |
| 5 | 19341322569415713958901 |
| 6 | 15762679542071167858843489 |
| 7 | 145082467753351661438130501937754420584096000083183992629 |