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 | 0 |
| 2 | 2 |
| 3 | 9 |
| 4 | 9 |
| 5 | 929 |
| 6 | 9 |
| 7 | 9 |
| 8 | 9 |
| 9 | 2633043 |
| 10 | 49618850 |
| 11 | 9 |
| 12 | 110361958311 |
| 13 | 2072735666087 |
| 14 | 1831797169511 |
| 15 | 91222349803976 |
| 16 | 1359811476184687 |
| 17 | 504939123701081904 |
| 18 | 9 |
| 19 | 122453792873589376894 |
| 20 | 623626925849389978443 |