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 | 16 |
| 3 | 564 |
| 4 | 93866 |
| 5 | 72054120 |
| 6 | 260324223938 |
| 7 | 4400423201461008 |
| 8 | 349815282628284276844 |
| 9 | 130501147375292529852604266 |
| 10 | 228964256366276749773274186140858 |