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 | 11 |
| 2 | 121 |
| 3 | 48983 |
| 4 | 1950230969 |
| 5 | 7169135482380621 |
| 6 | 2543060905110036322914145 |
| 7 | 90495116991790689711315590295804971 |