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 | 3 |
| 2 | 35 |
| 3 | 2021 |
| 4 | 536453 |
| 5 | 661407975 |
| 6 | 3780952160847 |
| 7 | 100240477650720585 |
| 8 | 12324646884990466825513 |
| 9 | 7027467861520236770627093435 |
| 10 | 18582989792598188051914777397933755 |