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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 131 |
| 4 | 29797 |
| 5 | 13193525 |
| 6 | 20887111133 |
| 7 | 140629309631387 |
| 8 | 3967227644736410265 |
| 9 | 449972212664372225366189 |