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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 13 |
| 6 | 62 |
| 7 | 801 |
| 8 | 49649 |
| 9 | 39768787 |
| 10 | 1974480504962 |
| 11 | 78522694637486171445 |
| 12 | 155041529758800625329015665441303 |
| 13 | 12174278697379026530632791354719900462885271361687873 |