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 | 1 |
| 2 | 122 |
| 3 | 1787655 |
| 4 | 3167175688854 |
| 5 | 678916835046916685242 |
| 6 | 17609365062977481891291808896932 |
| 7 | 55265734103510888653163896029554175314160719 |