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 | 13 |
| 3 | 463 |
| 4 | 3259 |
| 5 | 165713 |
| 6 | 10526573 |
| 7 | 495233371 |
| 8 | 196039655899 |
| 9 | 10687033762063 |
| 10 | 79006533276973 |
| 11 | 4313367040646779 |
| 12 | 1740318019946551973 |