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 | 2 |
| 2 | 7 |
| 3 | 88 |
| 4 | 25421 |
| 5 | 2077323118 |
| 6 | 9221293242272922067 |
| 7 | 170141182628636920942528022609657505092 |