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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 105 |
| 4 | 2702 |
| 5 | 154609 |
| 6 | 19092682 |
| 7 | 5161046609 |
| 8 | 3089394167519 |
| 9 | 4175309542037953 |
| 10 | 12956948188014836324 |
| 11 | 93772653247517510010693 |
| 12 | 1603175184493001749597050954 |
| 13 | 65450800470044797091307950768285 |