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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 10 |
| 5 | 91 |
| 6 | 5151 |
| 7 | 13741903 |
| 8 | 94490753712985 |
| 9 | 4464252567106907867941273716 |
| 10 | 9964775491460730298984873904585383048580645394630925051 |