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 | 10 |
| 2 | 100 |
| 3 | 30502 |
| 4 | 754898668 |
| 5 | 1426274971770170 |
| 6 | 214919363287707751206910 |
| 7 | 2685049440186600182381381075290270 |