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 | 19 |
| 4 | 1657009 |
| 5 | 9950006745799417075771 |
| 6 | 19389268200585836264288587113776883575610248525384021488302948711030121 |